What is the derivative of f(x) = 4x^3 + 9x + -5?

About this MCQ

Medium AP Exams item. Correct choice: B. 12x^2 + 9.

Correct answer

B. 12x^2 + 9

Explanation

12x^2 + 9 is the value that answers “What is the derivative of f(x) = 4x^3 + 9x + -5” (option B). Option A (12x^3 + 9) is a different value from 12x^2 + 9. Option C (12x^2) is a different value from 12x^2 + 9. Option D (4x^2 + 9) is a different value from 12x^2 + 9. Keep 12x^2 + 9 as the AP Exams fact for this stem.

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