Question

Help!

Answer 1

Do you have the zeros of the derivative?

Answer 2

They are 0, 2, and -2

Answer 3

ok. If you take the 2nd derivative and plug them in it will tell you which ones are maximums and minimums.
If the 2nd derivative is positive that's a minimum → dec to inc
If it's negative there's a max at that point → inc to dec

Answer 4

f"(x) = 12x²-16
f(0) = -16, so f(x) has a maximum at x = 0 and goes from increasing to decreasing

Answer 5

Put in the other 2 to check

Answer 6

At 2 it goes from decreasing to increasing

Answer 7

yes

Answer 8

And same thing for -2

Answer 9

right

Answer 10

Okay thank you!!

Answer 11

you're welcome