Exam-style question
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Let f(x) = x + 2 and g(y) = y^3. Which expression represents g ○ f?.
- A.x + 2^3
- B.(x + 2)^3
- C.x^3 + 2
- D.(x^3 + 2)^3
Model answer
What a good answer should say
- (x + 2)^3
Explanation
Why this works
First apply f to x, giving x + 2. Then apply g to this result, giving (x + 2)^3.
Common mistake
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