- #1
star321
- 7
- 0
Hello
i need help with a question, other people tried to help me, i just cannot get it! its driving me crazy:grumpy:
Two positive numbers have sum n. What is the smallest value possible for the sum of their squares?
so i have n=x+y
x>0 y>0
y=n-x
we want to minimize S S=x^2+y^2
S=x^2+(n-x)^2
S'=2x-2(n-x)
S'=2x-2n+2x
S'=4x-2n
now ? The above is what I have been shown to do... the red part doesn't make much sense to me... Can someone please help me to continue on...
i need help with a question, other people tried to help me, i just cannot get it! its driving me crazy:grumpy:
Two positive numbers have sum n. What is the smallest value possible for the sum of their squares?
so i have n=x+y
x>0 y>0
y=n-x
we want to minimize S S=x^2+y^2
S=x^2+(n-x)^2
S'=2x-2(n-x)
S'=2x-2n+2x
S'=4x-2n
now ? The above is what I have been shown to do... the red part doesn't make much sense to me... Can someone please help me to continue on...