The reason you take the dot product after the cross product is to get a scalar product. As the cross product gives you a vector product, when you take the dot product you get a scalar product meaning it only has magnitude (no direction) which is a numerical value such as 6 for example.
I know this question has been a year, but I will go ahead and answer in case someone needs it. If you change the order between the 3 vectors, you only change the sign of the result, but we take the absolute value to find its volume so it does not matter how you range those three vectors
MATH GODESSS YESS THANK YOU HELPED ME THROUGH COLUMBIA MATH
Thanks, I just started with Calculus III and this video helped clear up the problem.
You make so easy to digest. Thank you!
great video, really nice voice to listen to! :) make sure you make lots of videos youtube is my best teacher!
thx, ive watched your vids to help my hw for the past 2 weeks
You're welcome, I'm so glad the videos are helping! :)
Thank you for the video. Good and clear voice ❤
Brilliant video, great explanation.
I don't understand WHY we take the dot product after we find the cross product ? Why do we do this??
The reason you take the dot product after the cross product is to get a scalar product. As the cross product gives you a vector product, when you take the dot product you get a scalar product meaning it only has magnitude (no direction) which is a numerical value such as 6 for example.
Thank you so much for the clear explanation!
You're welcome! Glad you liked it.
how do I know what to cross with what?
If I could give this video multiple thumbs ups, I would.
+TripedalTroductions Thanks, glad you liked it!
While watching your video, I was trying to solve a problem in the book and later realized they were the same question.
Awesome lesson
I have a question could this work as well ---> PQXPR "dot" PS ?
yes because you could replace i j k in the matrix with the values of PS so then when you solved the matrix you would get the same answer
Also what happens to the coordinate of the vectors when we use Q as the reference?
Thanks ♥️ really appreciate your help
You're welcome, Himal! I'm happy to help! :D
My girlfriend is jealous of how much I like your videos. :)
Thank you so much ❤️
Lets say we were not given the point S, but were given a point T which is not connected to P. How can I solve that?
Nicely Done Krista.
Any Chance that you may want to become an Acturian?
Thanks! I don't know what an acturian is! :)
integralCALC actuarial science, actuaries.
ThePinoyMamba Oh! An actuary, got it! :D But I think I'll stick with integralCALC for a while. ;D
Thank you!
You're welcome, Randhima! :)
Thank you
What happens when you change the order of the cross and dot product? For instance - |PS * (PQ x PR)| is it equal to |PQ * (PR x PS)| ?
I know this question has been a year, but I will go ahead and answer in case someone needs it. If you change the order between the 3 vectors, you only change the sign of the result, but we take the absolute value to find its volume so it does not matter how you range those three vectors
@@Kayy_SS glad you did answer it, was wondering this exact thing 5 years later
great video thanks
You're welcome, Marko, so glad you liked it. :)
what if the volume is a negative number?
+William Reyes then you did the question wrong. volume cannot be negative
i don't remember posting this lol. I took vector calc 3 semesters ago
Collin Fox You take the absolute value because volume cannot be a negative value.Its not necessarily that you are wrong
Saludos hacia la clase de 7 a 8 de cálculo vectorial del profe lafarga que curiosamente se robó el ejercicio de la tarea de este video :v
Thnx mam
Hello world
THANK YOU!!!!!
You're so welcome! Glad it could help. :)
you are really awesome
You too! :D
Thanks
You're welcome, Tim! :)
thank you omg
:D
Finally😪😪
Easy pesy lemon squeezee
Thank you mam
You're welcome, Lavanya! :)
God.