What is the derivative of f(x) = 9x^5 + 7x + -9?
- A. 45x^4
- B. 45x^4 + 7 ✓
- C. 45x^5 + 7
- D. 9x^4 + 7
Correct answer
B. 45x^4 + 7
Explanation
Using the power rule, the derivative of 9x^5 is 45x^4, the derivative of 7x is 7, and the derivative of the constant -9 is 0. So f'(x) = 45x^4 + 7.
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