Derivatives of powers of polynomials

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Find the derivative $\;\;\;\frac{d}{dx}\left(3x-1\right)^{-4}$

**Answer**

$\;\;\;\frac{d}{dx}\left(3x-1\right)^{-4}$

$=-4\left(3x-1\right)^{-5}\left(3\right)$

$=-12\left(3x-1\right)^{-5}$