For f(x) = x³ − 4x, what is f′(2)?

Derivative of a Cubic Function at a Point

Easycalculusderivatives

For

f (x)

= x^{3} - 4 x

, what is

f^{'} (2)?

Show solution

Answer: B. 8

Differentiate term by term: f′(x) = 3x² − 4. At x = 2, f′(2) = 3(2²) − 4 = 8.

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