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Question

Mathematics Question on limits and derivatives

Derivative of the function f(x)=7x−3f(x) = 7x^{-3} is

A

21x−421 x^{-4}

B

−21x−4 - 21 x^{-4}

C

21x421 x^4

D

−21x4 - 21 x^4

Answer

−21x−4 - 21 x^{-4}

Explanation

Solution

f(x)=7(−3)x−3−1=−21x−4f(x) = 7 (-3)x ^{-3 -1} = -21 x^{-4}