# For what values of x is #f(x)= x^4-3x^3-4x-7 # concave or convex?

##### 1 Answer

Feb 12, 2017

the function is convex in

#### Explanation:

You would analyze the second derivative; the first one is:

then the second one is:

Let's solve the inequality

that's

Then the given function is convex in

and concave in

graph{x^4-3x^3-4x-7 [-5, 5, -27, 10]}