Derivatives of powers of polynomials

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Find the derivative $\;\;\;\frac{d}{dx}\left(2x+7\right)^{-2}$

**Answer**

$\;\;\;\frac{d}{dx}\left(2x+7\right)^{-2}$

$=-2\left(2x+7\right)^{-3}\left(2\right)$

$=-4\left(2x+7\right)^{-3}$