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AP Exams

What is the derivative of f(x) = 5x^3 + 4x + -4?

Correct answer

B. 15x^2 + 4

Explanation

Using the power rule, the derivative of 5x^3 is 15x^2, the derivative of 4x is 4, and the derivative of the constant -4 is 0. So f'(x) = 15x^2 + 4.

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