Is #f(x)=x^4-4x^3+x-4# concave or convex at #x=-1#?
1 Answer
Mar 22, 2016
convex
Explanation:
To find that out, we need to get the second derivative first.
Getting the first derivative.
We can easily find this using power rule.
Getting the second derivative.
Use power rule again.
Now that we know the second derivative, we will evaluate
• If
• If
Since