What is the derivative of f(x) = 5x^4 + 9x + 1?
- A. 20x^4 + 9
- B. 20x^3
- C. 20x^3 + 9 ✓
- D. 5x^3 + 9
Correct answer
C. 20x^3 + 9
Explanation
Using the power rule, the derivative of 5x^4 is 20x^3, the derivative of 9x is 9, and the derivative of the constant 1 is 0. So f'(x) = 20x^3 + 9.
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