What is the derivative of f(x) = 2x^4 + 2x + -9?
- A. 8x^3
- B. 8x^3 + 2 ✓
- C. 8x^4 + 2
- D. 2x^3 + 2
Correct answer
B. 8x^3 + 2
Explanation
Using the power rule, the derivative of 2x^4 is 8x^3, the derivative of 2x is 2, and the derivative of the constant -9 is 0. So f'(x) = 8x^3 + 2.
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