Question

f(x) = 9x^3 − 27x − 19
x =
I got 1, but the homework tells me it is wrong, PLEASE help me out!

Answer 1

\[27x ^{3} - 27 = 0 and then 27x ^{2} = 27 x ^{2} = 1 x = 1\]

Answer 2

27x^2 - 27 = 0

Answer 3

27x^2 = 27

Answer 4

x^2 = 1

Answer 5

so therefore x = 1????

Answer 6

could it be (-1,1)

Answer 7

nope

Answer 8

on the other problems they drop the 19 and just use chain rule and solve for x

Answer 9

power*

Answer 10

no, -3,3 isnt right either, im thinking about telling my teacher that she is wrong. im serious ive been in a library for three hours doing homework!

Answer 11

what do you get for this one f(x) = 4x^3 + 4x^−3

Answer 12

you're finding critical points