What is the derivative of f(x) = 5x^3 + 4x + -4?
- A. 5x^2 + 4
- B. 15x^2 + 4 ✓
- C. 15x^3 + 4
- D. 15x^2
Correct answer
B. 15x^2 + 4
Explanation
Using the power rule, the derivative of 5x^3 is 15x^2, the derivative of 4x is 4, and the derivative of the constant -4 is 0. So f'(x) = 15x^2 + 4.
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