21: After substituting the limit point into the given expression you should get

Remark: The 0⁺ can be seen like this: Instead of substituting to the original quadratic polynomial, substitute into its factorization (x + 3)⋅(x − 2). You get 0^-⋅(−5) = 0⁺.

Hint on limit at −∞
Hint on limit at 3 from the right
Hint on limit at ∞
Answer