Hello, m777!

2) Find if

Differentiate implicitly: .

Then: .

Factor: .

Therefore: .

3) a) What are the critical points of ?

b) On what interval(s) is increasing or decreasing?

. . . .

(a) Critical points occur where

. . .This happens when: .

To the left of , we have: . .Decreasing:

Between and , we have: . .Increasing:

To the right of , we have: . .Increasing:

Therefore:

. . is decreasing on

. . is increasing on