se the function f(x) = x^4 - 40 x^3 to answer:

at what value(s) of x does f have a local maximum or a local minimum?

Find the x-coordinates of all inflection points.

I found the values of x where the slope of the curve = 0 (0,30)

Question

se the function f(x) = x^4 - 40 x^3 to answer:

at what value(s) of x does f have a local maximum or a local minimum?

Find the x-coordinates of all inflection points. 

I found the values of x where the slope of the curve = 0 (0,30)

anonymous · Answer

uh oh boy kinda had the same problem as me

anonymous · Answer

elem. calculus

anonymous · Answer

do i need to plug that in somewhere?

precal · Answer

You need to take the derivative of the function twice.
It is the second derivate that tells you about max and min