Is #f(x) =(x+2)^2/(x-1)# concave or convex at #x=-1#?
1 Answer
Nov 27, 2017
concave
Explanation:
Let's calculate the second derivative and then find the sign of it when
The first derivative is:
The second derivative is:
that's less than 0 at
Then the given function is concave at
graph{(x+2)^2/(x-1) [-10, 10, -20, 20]}