What is the derivative of f(x) = 4x^3 + 9x + -5?
- A. 12x^3 + 9
- B. 12x^2 + 9 ✓
- C. 12x^2
- D. 4x^2 + 9
Correct answer
B. 12x^2 + 9
Explanation
Using the power rule, the derivative of 4x^3 is 12x^2, the derivative of 9x is 9, and the derivative of the constant -5 is 0. So f'(x) = 12x^2 + 9.
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