a. Find the critical points of f(x)=6x^4

e^-x

b. Use the First Derivative Test to locate the local maximum and minimum values.

c. Determine the intervals on which f is concave up or concave down. Identify any inflection points.

a. Identify all the critical points. Select the correct choice below and fill in any answer boxes within your choice.

A. The function has critical points at x=___

A. The function has critical points at x = 0.