Question

Find the absolute maximum and absolute minimum values of the function

f(x) = x^4 - 8 x^2 - 10
at interval [-3,-1] and [-4,1].

Answer 1

It says that min is not -17?

Answer 2

but no matter what I do, I keep getting it at -17, which is apparently wrong.

Answer 3

f(x) = x^4 - 8 x^2 - 10
f'(x)=4x^3-16x=0
4x(x^2-4)=0
x=0
x=2
x=-2
so its -2 ^^

Answer 4

For the absolute min in both scenarios/intervals?

Answer 5

Oh I see. I made the mistake I always make. Thanks!

Answer 6

np