What is the derivative of f(x) = 9x^2 + 9x + -5?
- A. 18x + 9 ✓
- B. 18x^1
- C. 9x^1 + 9
- D. 18x^2 + 9
Correct answer
A. 18x + 9
Explanation
Using the power rule, the derivative of 9x^2 is 18x^1, the derivative of 9x is 9, and the derivative of the constant -5 is 0. So f'(x) = 18x + 9.
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