# Is #f(x)=-2x^4-x^3+4x+4# concave or convex at #x=-1#?

##### 1 Answer

Dec 1, 2015

concave

#### Explanation:

Find the second derivative and then compute

Since

Note: "concave" can also be called "concave downward" or "convex upward". It means the graph is heading downwards.