What is the derivative of f(x) = 9x^4 + 8x + -2?
- A. 36x^3 + 8 ✓
- B. 36x^3
- C. 9x^3 + 8
- D. 36x^4 + 8
Correct answer
A. 36x^3 + 8
Explanation
Using the power rule, the derivative of 9x^4 is 36x^3, the derivative of 8x is 8, and the derivative of the constant -2 is 0. So f'(x) = 36x^3 + 8.
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