What is the derivative of f(x) = 5x^3 + 8x + -1?
- A. 15x^2
- B. 15x^2 + 8 ✓
- C. 15x^3 + 8
- D. 5x^2 + 8
Correct answer
B. 15x^2 + 8
Explanation
Using the power rule, the derivative of 5x^3 is 15x^2, the derivative of 8x is 8, and the derivative of the constant -1 is 0. So f'(x) = 15x^2 + 8.
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