Evaluate for .

MATHEMATICS · Single correct · A Level · Mathematics · Differentiation · Differentiation

Problem

Evaluate lim⁡h→0(x+h)−2−x−2h\displaystyle \lim_{h\to0}\frac{(x+h)^{-2}-x^{-2}}{h} for x>0x>0. (a) −2x−4-2x^{-4} (b) −x−3-x^{-3} (c) −2x−3-2x^{-3} (d) 2x−32x^{-3}

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