What is the derivative of f(x) = 3x^5 + 8x + -9?
- A. 15x^4
- B. 15x^4 + 8 ✓
- C. 15x^5 + 8
- D. 3x^4 + 8
Correct answer
B. 15x^4 + 8
Explanation
Using the power rule, the derivative of 3x^5 is 15x^4, the derivative of 8x is 8, and the derivative of the constant -9 is 0. So f'(x) = 15x^4 + 8.
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