What is the derivative of f(x) = 9x^4 + 5x + -8?
Difficulty: Medium
About this MCQ
Medium AP Exams item. Correct choice: A. 36x^3 + 5.
- A. 36x^3 + 5 ✓
- B. 36x^4 + 5
Why not B: “36x^4 + 5” is not 36x^3 + 5.
- C. 9x^3 + 5
Why not C: “9x^3 + 5” is not 36x^3 + 5.
- D. 36x^3
Why not D: “36x^3” is not 36x^3 + 5.
Correct answer
A. 36x^3 + 5
Explanation
36x^3 + 5 is the value that answers “What is the derivative of f(x) = 9x^4 + 5x + -8” (option A). Option B (36x^4 + 5) is a different value from 36x^3 + 5. Option C (9x^3 + 5) is a different value from 36x^3 + 5. Option D (36x^3) is a different value from 36x^3 + 5. Keep 36x^3 + 5 as the AP Exams fact for this stem.
Source: Original practice question, MCQsHub
Tags: Using, derivative Using, Using power, 36x^3 + 5
Submitted by: MCQsHub Editorial