Hello, stewpot!

I don't understand the procedure you're using . . .

. . First Derivative Test for the "left side"?

. . Second Derivative Test for the "right side"?

told you to do it that way ??Who

Set the first derivative equal to zero: .Find and identify the stationary points for: .

. . which factors:. .

. . and has roots: .

Stationary points: .

Second Derivative Test: .

. .

. .