Question

determine where the function is concave upward and downward and list all the x- values of the points of infection

f(x)=3x^3+3x^2+9x-2

Answer 1

i think concave upward because no reflection

Answer 2

for point set =0 and solve it

Answer 3

you set the second derivitive to zero?

Answer 4

i did and i got -1/3

Answer 5

It is a lot of steps, first you find the roots of the original equation.

Answer 6

from the second derivative?

Answer 7

I messed up, solve the first derivative and then make a number line.

Answer 8

so what will it be?