### Home > CALC > Chapter 9 > Lesson 9.1.2 > Problem 9-30

9-30.

No calculator! Find the interval(s) over which

If you differentiate this function correctly, the second derivative is:

The graph of the function is concave down when *f* ″(*x*) < 0.

9-30.

No calculator! Find the interval(s) over which

If you differentiate this function correctly, the second derivative is:

The graph of the function is concave down when *f* ″(*x*) < 0.