What is the derivative of f(x) = 5x^4 + 7x + 3?
- A. 20x^4 + 7
- B. 20x^3 + 7 ✓
- C. 20x^3
- D. 5x^3 + 7
Correct answer
B. 20x^3 + 7
Explanation
Using the power rule, the derivative of 5x^4 is 20x^3, the derivative of 7x is 7, and the derivative of the constant 3 is 0. So f'(x) = 20x^3 + 7.
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