What is the derivative of f(x) = 1x^3 + 9x + 3?
- A. 3x^2 + 9 ✓
- B. 1x^2 + 9
- C. 3x^3 + 9
- D. 3x^2
Correct answer
A. 3x^2 + 9
Explanation
Using the power rule, the derivative of 1x^3 is 3x^2, the derivative of 9x is 9, and the derivative of the constant 3 is 0. So f'(x) = 3x^2 + 9.