Question

HELP!!! PLEASE!!!
the question is to DETERMINE all critical points for the following function.
f(x)= 2x^2 - 216*sqrt(x)

PLEASE PLEASE HELP!! thank you!

Answer 1

take the first derivative and find where f'(x)=0

Answer 2

i did and then i got 4x-108/sqrt(x)

and then when u subsittute x=0, you get 0/undefined...and then how would you get the other critical value??

Answer 3

set your derivative to zero, dont plug zero in for x

Answer 4

then solve for x

Answer 5

so how do u do that?
i dont get how to solve for x...

Answer 6

would it be 9?

Answer 7

hey! i got it! :DD
thx for your help!

Answer 8

k