# For what values of x is # f(x) = e^(4x)-4e^(2x)+e^x # concave or convex?

##### 1 Answer

Nov 20, 2017

Concave:

Convex:

#### Explanation:

First we need to calculate the second derivate of the function,

then we equal it to

and we solve for

and we substitute the second derivate by a number between these intervals: