### Home > APCALC > Chapter 3 > Lesson 3.4.4 > Problem 3-183

3-183.

Determine algebraically whether is concave up or concave down at

*and at*

*. Then, verify your solution with a graph of*

*Homework Help ✎* .

A function is concave up when its 2nd-derivative is positive and concave down when its 2nd-derivative is negative.