i just read thru 1 to 5 and coz they are the easiest to square and cube. I got 5 in 5 seconds coz we needed it to add to zero. k having a 4i makes no sense to zero, so it can't be an answer.
What is the point in unnecessarily puzzling the brain???? I am an Engineer, yet always wonder what's the use of this in professional & day to day life. I retired in 2024. Never ever in life such puzzles appeared in my life or hindered the progress in my life. Life is precious, don't waste it in getting entangled in such unwanted, uncalled for puzzles.
@@maheshmahatekar2885 certainly these puzzles make you mentally alert. My father used to systematically solve maths problems and never had any mental issues till the age of 95
KxKxK - KxK = 100 ... K la a 2(K-1)=5 la a 2 x 4 .. K la 2 (K-1)=5 la 2 x 4 ... K la 2 = 5 la 2 & K-1=4 .. K=5 in ambele cazuri .. verificare 5x5x5 - 5x5=125 - 25 = 100
One of the correct answers is 5. There are other values of k that satisfy the equation, so the rigorous solution is presented. Not at all difficult, just a bit tedious.
Hello. As soon as I saw the video,I found out verbally that the value of the "K" coeffıcient is 5.
5×5×5-5×5=
(5×5×5)-(5×5)=
(125)-(25)=
125-25= 100
💝
Where did the 125 and 25 come from
This is just a special case and a nice exercise for practice. Just change the 100 to 99 and it gets messy real fast.
k3 - k2 - 100 = (k - 5)*(k2 + 4k + 20)
Do k2 + 4k + 4 >=0 nên k2 + 4k +20 >= 16
Vậy chỉ có k = 5 phù hợp.
Detalhado, importante pra quem está aprendendo matemática
Relações de Girard?
To much unnecessary simplification
@@itishajain83 too many, yeah.
Too many, yeah.
K should be equal to 5
K k k-k.k=100
5.5.5-5 t=125-25=100
= 5
Simple
K³-K² = 100
K² (K-1) = 100
K² (K-1) = 25 x 4
K² = 25 and K-1 = 4
K = 5
@@SubhanSean Simple, but incomplete.
@@evlorenzoni yes only one solution
К^3-к^2=100, к^3=к^2+100, уравнение имеет единственный положительный корень 5.😊
K^3-k^2=100
K^2(k-1)=100
It is very evident that k is 5 here. No need of playing with the equation.
K=5
❤❤❤❤❤
k^3-k^2+/-k-100=0 , (k-5)(k^2+4k+20)=0 ,
1 -5
4 -20
20 -100
5x5x5-5x5
125-25=100
k*k*k-k*k=100
5*5*5-5*5=25*5-5*5=125-5*5=125-25=100
k=5
Why the two solutions are =0 ; =0 how do u know?
i just read thru 1 to 5 and coz they are the easiest to square and cube. I got 5 in 5 seconds coz we needed it to add to zero. k having a 4i makes no sense to zero, so it can't be an answer.
k•k•k-k•k=100
k³-k²=100
k³-k²-100=0
k³-125-k²+25=0
(k³-125)-(k²-25)=0
(k-5)(k²+5k+25)-(k-5)(k+5)=0
(k-5)(k²+4k+20)=0
k²+4k+20=0
k²+4k+4=-16
(k+2)²=-16
|k+2|=4i
k+2=±4i
k=-2±4i ❤❤
k-5=0
k=5 ❤
5◇3-5◇2
வணக்கம்.
எதற்காக இத்தனை கஷ்டம்.
4mn20 why k-5 = 0 ?
3k-2k is 1k. So k=100
K.k.k.-K..k :100
K(k.k)-(k.k). :100
K : 💯
Answer is 5
What is the point in unnecessarily puzzling the brain????
I am an Engineer, yet always wonder what's the use of this in professional & day to day life. I retired in 2024. Never ever in life such puzzles appeared in my life or hindered the progress in my life. Life is precious, don't waste it in getting entangled in such unwanted, uncalled for puzzles.
@@maheshmahatekar2885 certainly these puzzles make you mentally alert.
My father used to systematically solve maths problems and never had any mental issues till the age of 95
A solução parecia simples, muito pelo contrário.
5
KxKxK - KxK = 100 ... K la a 2(K-1)=5 la a 2 x 4 .. K la 2 (K-1)=5 la 2 x 4 ... K la 2 = 5 la 2 & K-1=4 .. K=5 in ambele cazuri .. verificare 5x5x5 - 5x5=125 - 25 = 100
Use Zero method to find the solution.
10 секунд надо чтобы решить эту легкотю. Зачем эта математика?
This is wrong because (a+b)2 is a2+2ab+b2
lf you knew k = 5, why all these many unnecessary steps
Omg weird!
Very long method,no not good
Why are you ruining your brain with such puzzles? You could have said right away that the correct answer is 5.
One of the correct answers is 5. There are other values of k that satisfy the equation, so the rigorous solution is presented. Not at all difficult, just a bit tedious.
Your solution doesn't work in this competitive world.
There are some unnecessary steps.
For ads and views.
5
k = 5
5
K=5
K=5
5
5
5