What is the derivative of f(x) = 9x^3 + 4x + 5?
- A. 9x^2 + 4
- B. 27x^3 + 4
- C. 27x^2
- D. 27x^2 + 4 ✓
Correct answer
D. 27x^2 + 4
Explanation
Using the power rule, the derivative of 9x^3 is 27x^2, the derivative of 4x is 4, and the derivative of the constant 5 is 0. So f'(x) = 27x^2 + 4.
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