# Is #f(x)=10x^5-7x^4+x-4# concave or convex at #x=-1#?

##### 1 Answer

Jul 20, 2017

f is concave at

#### Explanation:

We will find the second derivative and substitute the given value of x; if

Then f is concave at

graph{10x^5-7x^4+x-4 [-5, 2, -40, 2]}