What is the derivative of f(x) = 1x^2 + 8x + -9?
- A. 2x^1
- B. 2x + 8 ✓
- C. 2x^2 + 8
- D. 1x^1 + 8
Correct answer
B. 2x + 8
Explanation
Using the power rule, the derivative of 1x^2 is 2x^1, the derivative of 8x is 8, and the derivative of the constant -9 is 0. So f'(x) = 2x + 8.