### Home > APCALC > Chapter 9 > Lesson 9.1.2 > Problem 9-29

9-29.

No calculator! Find the interval(s) over which *f*(*x*) =

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

The graph of the function is concave down when .

9-29.

No calculator! Find the interval(s) over which *f*(*x*) =

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

The graph of the function is concave down when .