@@apeacefulworldijustwant6471 Who knows? Perhaps she wasn't paying attention and had work to do. Maybe she has a bad teacher and Khan Academy is the only way for her to understand it. Maybe it's a combination of those two things.
Im just smilling in emotional pain throughout the video.. and im trying yo learn this for online class😃. Then WHAAAAAT IS THE DOMAIN OF 3x²+6x-2 ?!! Aaaaaah
I'm trying to learn this for online school as well. There are multiple domains for the equation. The domains were the x values in the table that he made. The range was the answer to the equation after he plugged the x value into the equation.
Wow I learned this lesson in just 8 minutes while my prof was teaching for 1 hour I can't even understand a single thing. Thanks man, you're the real MVP!
Khan academy helped me do well on my placement test for college, and is now helping me get through my precalculus algebra and trig classes 💚💚💚 Thank you!!!
ik you commented this like year ago but did you understand it? if so please help me, because i have a test tomorrow and i’ve been out the whole week/unit so i don’t really understand it.
Hi, I am a student of University of the People, I have really benefited a lot from your programs. Thank you so much for all your selfless efforts to help us as students. We have learned a lot.
I've been constantly trying to understand the domain and range from all kinds of different angles and i think I'm finally getting it. Don't give up, keep pushing
My math teacher has not given the virtual students(my school is in person with the option to be online) a single lesson but still expects us to understand and do the homework. These videos are my only hope lol.
i find that khan academy is not the best channel for subjects. The organic chemistry tutor is the best because he teaches the basics and gives a bunch of examples of different types.
we had this during grade 8 but I totally forgot all about it and because school just started we are reviewing past lessons. my teacher makes it really confusing and his grammar makes it a whole lot worse! thank you!! you're a life saver
Thank U very much sir....I was very much confused with the Concept of Range.....but Now its clear as U explained it Graphically....Thank u very much once more sir.....Excellent !!!!
I spaced out most of my class so Kahn Academy don’t let me down :,) I’ll update and see if this helped me Edit: IT DID I MAKE A PRETTY GOOD GRADE ON MY TEST
These comments are sad lol! For yall, just think like "Aight, gotta plug in some numbers wherever I see an x and BOOM, I get a number out the other side ( the f(x) side)" The graph just shows what's going on with a line instead of numbers... hope I helped a lil🙏
Also like, Domain is ALWAYS x, and Range is always y. If you look at Range, the g in the word is kinda long and lanky, like y. You can also think of the range of a "rocket", going up or down only.
Hi Sal, pretty well with the graph explanation but make it a bit simpler. Find f(x)=y such that the determinant is negative and the number turns imaginary. Since for y=-5, you get 3(x-1)^2 and hence the determinant must be 0 because there are equal roots, any y below -5 would make the discriminant 0 and hence the range is [-5,∞). This is what I was taught in 8th grade.
Thank you so much since I just started in the K to 12 curriculum, I have prelims to answer this for I'm not a good mathematician but a great listener. Thx
I’m in my 3rd year of Uni taking mathematics of natural science and it’s hard because my prof assumes I remember everything from trig and algebra and all but it’s been over 3 years since I’ve taken a class like that so I feel so incredibly behind. I’ve always liked math but I’m struggling a lot rn
One can also calculate the range by using differentiation... That'll make it easier. But yeah, this falls into algebra, before the calculus. So, great. Btw, thanks a mountain for this video! 🎉
1:03 11 years late, but technically speaking, Real numbers ARE Complex numbers, in the form of a + 0i. More accurately, real numbers are any number that does not contain imaginary parts. (And Imaginary numbers would be any complex number in the form of 0 + bi). Which is a little too complicated for anyone who isn't familiar with complex numbers, but I wouldn't have said Real numbers are everything but Complex numbers, since, you know, they are contained in the Complex number group.
josh lerio no, you aren't imagining it, it took me forever to realize it too, but the range is always going to be the y-axis or the y of an order pair (x,y) and domain will always be the x-axis and the x of an order pair (x,y). Also to find the range on a graph, when looking at the y-axis it's going to be where the graph starts and ends, kind of like when you do a vertical test with a pencil to see if a graph is a function, you bring that pencil up from where it starts, and down to where it ends to see if no other point crosses. The same goes for the domain, but instead of the vertical test, it's the horizontal test, where you bring the pencil from left to right on the graph, to see if no points will cross.
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*I’m watching this through my tears lol*
SAME
Why?
sameee
@@apeacefulworldijustwant6471 Who knows? Perhaps she wasn't paying attention and had work to do. Maybe she has a bad teacher and Khan Academy is the only way for her to understand it. Maybe it's a combination of those two things.
ME OMG
from the bottom of my heart, thank you for helping me throughout the years
:) he's a hero
How is it going))
Starry Night good
@@Sss-mb5qs Same Here
Plus one!
y’all be really listening while im just reading comments and be like yeah it’s hard.
Lol same 😂😂
hahahah same😂
Rt
I'm reading the comments to see whether I can help anyone out :)
Fr fr
I'm starting to think I have a learning disability.
me too lmao
Same
Nah it’s okay if you don’t get it right away just keep at it and I know you can win
Me rn:
When you got soo much work to do that you don't even have the time to cry :>
Cheer up!! We can do this.
Same
Why does it feel like I'm always watching math videos but never actually retaining the information?
because thats whats happening
Bc our brain puts out information we don’t need
@Spla Dunctious it iz what it iz
@Spla Dunctious not really
@Spla Dunctious that’s cool, but that just means you need it, not me
I'm watching this video and I still don't understand. God bless me.
Same bro
Can i explain to you
You Wii definitely understand
@@sonukr.3155 that was months ago. I understand it now. Thanks though👍👍
@@hady141 I need help🥲🥲
HAHAHAHA😂👍
Im just smilling in emotional pain throughout the video.. and im trying yo learn this for online class😃.
Then WHAAAAAT IS THE DOMAIN OF 3x²+6x-2 ?!! Aaaaaah
I'm trying to learn this for online school as well. There are multiple domains for the equation. The domains were the x values in the table that he made. The range was the answer to the equation after he plugged the x value into the equation.
All real numbers
all real numbers. for any x value that is real there is a y value that is real
its everything, cause literally nothing can break the function
Wow I learned this lesson in just 8 minutes while my prof was teaching for 1 hour I can't even understand a single thing. Thanks man, you're the real MVP!
ayyy i found a kpop stan in a maths video
@@tehreemj6350 I love kpop more than studying
@@ilovehuhyunjin08 ok lil guy
@@Kratos-kt6ywaint nobody like studiying
low-key freaking out cause I took a high level in math thinking i'd do well. But all i've learned so far is that I'm as smart as a rock :)
you got this
mood af.
Lol
Dominix and Rangey, That's how my teacher put it to remind us that the domain=x an the Range=y
You and Failzor2 must be classmates
+Nuck Chorris my teacher always talked about his friend deXter rileY
Wow lol u made tht more easy for me!
Gonna use that...
With all due respect, it’s not very hard to memorize what the meanings of two words are.
Khan academy helped me do well on my placement test for college, and is now helping me get through my precalculus algebra and trig classes 💚💚💚
Thank you!!!
😅
when obama can teach you math
Joshua Isaiah Navarro ahhahahahahahahahahah this comment is lit😂😂😎😎
Blueberry Cheesecake 555 stop
Blueberry Cheesecake do you play chess?
Because you are slightly late.
lmao this had me rolling
not me crying right now because i have a test in a couple days and i was supposed to learn this forever ago
did u pass? give me hope :(
Like Ur profile pic
ik you commented this like year ago but did you understand it? if so please help me, because i have a test tomorrow and i’ve been out the whole week/unit so i don’t really understand it.
fr
@@brandonrobledo4281 how was your test
Hi, I am a student of University of the People, I have really benefited a lot from your programs. Thank you so much for all your selfless efforts to help us as students. We have learned a lot.
That university is real?
@@comfortkabanshi5048 yes the university is real and has very amazing experience.
I've been constantly trying to understand the domain and range from all kinds of different angles and i think I'm finally getting it. Don't give up, keep pushing
Why can't my math teacher teach this well?
Ikr! I had to watch that exact video last night!
My math teacher has not given the virtual students(my school is in person with the option to be online) a single lesson but still expects us to understand and do the homework. These videos are my only hope lol.
i know you commented this a year ago but im going through the same thing, what did you do to get through it?? :)
@@ninjapiggy1274 What helped me honestly was using apps like Photo Math to solve an example question and then I'd try to figure it out myself
@@ninjapiggy1274 I also asked friends and tried to work it out with somebody
@@kao4266 oo ill try that tysm :))
lsgh?
im just stupid I think, ive watched so many videos and I still don't understand
same bro, same
Same
Same
SamER
i find that khan academy is not the best channel for subjects. The organic chemistry tutor is the best because he teaches the basics and gives a bunch of examples of different types.
When I have a quiz about this 20 mins from now but I still can't learn it 👁️👄👁️
Any updates
My teacher put it this way. Dominix and Rangey, Domain being x and range being y.
Thats really helpful, I'll remember that, thanks 😊
W teacher
r u still alive
@@cloud6136 lol
god i wish I had ur teacher
we had this during grade 8 but I totally forgot all about it and because school just started we are reviewing past lessons. my teacher makes it really confusing and his grammar makes it a whole lot worse! thank you!! you're a life saver
i just watched this before going to the exam
YOU SAVED MY LIFE BROTHER
MUCH LOVE TO YOU
Funny Videos Of All Time hahahahahahaha
lmao what a mood but highkey true XD
I wish my brain is like yours :(
Why does my brain can't function when I heard the word math?
My brain does that toooooo. It completely turns off after hearing the word math.
@@lilac_moon1457 u didn't get it lol
@@luc.b6951 what?
Fr I'm over here watch math vids for my test I'm doing and sont understand nothing
Funny how i'm learning more from this channel than my PAID college.
Sal,your voice,makes me happy😃😃
Thank yooou! i have an exam in 3 days and this really helped!
what country are you from? my exam is also on Tuesday?
+Joseph Adame Australia 🇦🇺
+Tapprincess45 ah, ok
Soo much better than my teacher in school, she never explains anything properly, unlike you.
My mind has made the decision to shut down when it hears anything about numbers adding subtracting multiplying or dividing
How to solve:
Function. Domain. Range
1.y=7-5x. ? ?
2.y=2x²
3.y=squareroot of X
4.y=-x²
5.y=10-3x
Thank U very much sir....I was very much confused with the Concept of Range.....but Now its clear as U explained it Graphically....Thank u very much once more sir.....Excellent !!!!
Thank you, Domain and range give me so much trouble in pre-cal. Video has given me a good understanding.
My A level exam for Pure Mathematics 1 starts in less than 5 hours so this helped
It's so easy to understand ! life is like trying to set up domain and give it's a law to get a range ,thus we can get a different life .
bro what...
What is the name of the man who does these lessons? He needs an award.
Thanks so much from 12 years after the release of this video.
I spaced out most of my class so Kahn Academy don’t let me down :,) I’ll update and see if this helped me
Edit: IT DID I MAKE A PRETTY GOOD GRADE ON MY TEST
"JAI HIND DOSTON "🇮🇳
Why does my brain stop functioning when I heard the word function
These comments are sad lol! For yall, just think like "Aight, gotta plug in some numbers wherever I see an x and BOOM, I get a number out the other side ( the f(x) side)" The graph just shows what's going on with a line instead of numbers... hope I helped a lil🙏
Also like, Domain is ALWAYS x, and Range is always y. If you look at Range, the g in the word is kinda long and lanky, like y. You can also think of the range of a "rocket", going up or down only.
i can feel my head pulsating
Thanks sir for explaining this topic . You helped me a lot . I never saw teacher like you .
I cannot thank you enough for these videos. They are extremely helpful to me. I need all the help I can get :D
Watching this 20 minutes before my unit test
Hi Sal, pretty well with the graph explanation but make it a bit simpler. Find f(x)=y such that the determinant is negative and the number turns imaginary. Since for y=-5, you get 3(x-1)^2 and hence the determinant must be 0 because there are equal roots, any y below -5 would make the discriminant 0 and hence the range is [-5,∞). This is what I was taught in 8th grade.
Anyone who teaches this garbage is not human.
Anyone who can solve them is a sorcerer of sorts.
This stuff is unrealistic trash
Thank you so much since I just started in the K to 12 curriculum, I have prelims to answer this for I'm not a good mathematician but a great listener. Thx
Currently having a mental breakdown, but I still got math homework so here i go >:(
Really shows just how messed up the school system is...
“Functions are often disappointing.”
“Now, the domain can be whatever I want.”
I spaced out while watching this
thAnks to this...now I know...this is so easy.yet when our teachr discussed it..it seem to complicated ......BIG BIG THANKSTO THIS!!!!!!
Omg thank you so much! Literal life saver 😭❤️
khan academy literally always saving my semester!
I’m in my 3rd year of Uni taking mathematics of natural science and it’s hard because my prof assumes I remember everything from trig and algebra and all but it’s been over 3 years since I’ve taken a class like that so I feel so incredibly behind. I’ve always liked math but I’m struggling a lot rn
Thank you, you make it look so easy.
no one has ever made me understand maths like this before
Watching this to study the day of a pre cal challenge exam. Fingers crossed
Awesome. Thank you . I had this question on the assignment due after march break . Thank you .
I am going to get 2 points tomorrow because of this video. Thanks, Khan Academy !!
Thanks for this vid, finally someone that can explain it to me clearly enough to stick to my mind.
Thank you for your video😊.It helps a lot😊
Very good!!! Good luck to Khan Academy Group
3(x)^2 + 6x - 2 , when we say the first value of X is -2 then (-2)^2 is -4 then 3x-4=-12.. meaning the first value is -26 and not -2
crying cuz i forgot all about this and have to relearn it all 💀🤡
This is very complicated cause I am learning this in the 8th grade...
thanks for this. this is awesome. I'm starting to enjoy mathematics
Academic comeback of the century
I’m learning this literally right before a test 💀
Am I the only one that loves this guys voice
I wish he provided more examples. This function is all real numbers because it doesn't contain neither a square root or a division. simple.
Ive got a math test tomorrow thx so much for thd help
Thanx a-lot u are helping me .. thank God 🙏for having good ppl who would love ❤️ to help others for nothing .
EXCELLENT LECTURE INDEED!!!
Best explanation! Finally understood!!
my prof decided since carona us math students dont DESERVE ZOOM LECTURES ( even tho my tuition is paying for them) god bless you bro
Watching this video mid test
Thank you so much sir
I love your lesson I learn a lot from watching this ☺ but 1 thing that I didn't understand is the range on the last part..
thank you teacher.
Thanks alot its really helpful
Thank you so much It helped. I got a Maths test in an hour and a half. a little scared but you helped Thanks. I am grade 9 btw
Thanks for the explanation, you're clapped.
BRO ur a lifesafer
Hi 👋 hi 👋 can you help me please answer to this question (Q3) Sketch the function y = V-|x| and find its domain and range.
wow..thanks you..nice explaination
Love from Bangladesh 🇧🇩 ❤ sir
Thank u sir , it was very useful.....🙏🏻
Thanks for saving my grades
Thank you! I have an exam tomorrow.
One can also calculate the range by using differentiation... That'll make it easier. But yeah, this falls into algebra, before the calculus. So, great.
Btw, thanks a mountain for this video! 🎉
Thank you for this video, I am in Algebra 2, but I don't have a teacher assigned yet soooo... ye thanks! :)
1:03 11 years late, but technically speaking, Real numbers ARE Complex numbers, in the form of a + 0i. More accurately, real numbers are any number that does not contain imaginary parts. (And Imaginary numbers would be any complex number in the form of 0 + bi).
Which is a little too complicated for anyone who isn't familiar with complex numbers, but I wouldn't have said Real numbers are everything but Complex numbers, since, you know, they are contained in the Complex number group.
OMG This is actually so good
our Domain and range only has {x|x} or {y|y}, no graphs or table of values, how about that???
You may like to check my video too on intercepts, domain, and range
You may like to check my video too on intercepts, domain, and range
this is very helpful, thankyou!
Thanks
Thanks 🙏 😊
thanks, nice video
Thank you, you save me through high school😂
you can write the range like [-5,+inf) and thank you
you mean (-5,R)
No, Like This (-5, infinity sign)
No, I mean what I said
If the sign greater than and less than have equal, we write it like what I said .
Where did you get your -2,-1,0,1?
it's whatever number value you can think of provided that you have the capacity to graph it
He inputted his own x values
he used the table of values.. since the domain is all real numbers.. any real number is possible to substitute the value of x
You choose any values you want to substitute (x)
Random
For the range, is it always bound to the y axis? and domain in the x axis? Or am I just imagining false information that will mislead me?
josh lerio no, you aren't imagining it, it took me forever to realize it too, but the range is always going to be the y-axis or the y of an order pair (x,y) and domain will always be the x-axis and the x of an order pair (x,y). Also to find the range on a graph, when looking at the y-axis it's going to be where the graph starts and ends, kind of like when you do a vertical test with a pencil to see if a graph is a function, you bring that pencil up from where it starts, and down to where it ends to see if no other point crosses. The same goes for the domain, but instead of the vertical test, it's the horizontal test, where you bring the pencil from left to right on the graph, to see if no points will cross.