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