What is the derivative of f(x) = 9x^2 + 7x + 9?
- A. 18x^1
- B. 18x + 7 ✓
- C. 18x^2 + 7
- D. 9x^1 + 7
Correct answer
B. 18x + 7
Explanation
Using the power rule, the derivative of 9x^2 is 18x^1, the derivative of 7x is 7, and the derivative of the constant 9 is 0. So f'(x) = 18x + 7.
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