derivative x/(x^2-8)

解

導関数

\frac{x}{x ^{2} - 8}

\frac{- x ^{2} - 8}{( x ^{2} - 8 ) ^{2}}

解答ステップ

\frac{d}{d x} (\frac{x}{x ^{2} - 8})

商の法則を適用:

(\frac{f}{g})^{'} = \frac{f ^{'} \cdot g - g ^{'} \cdot f}{g ^{2}}

= \frac{\frac{d x}{d x} ( x ^{2} - 8 ) - \frac{d}{d x} ( x ^{2} - 8 ) x}{( x ^{2} - 8 ) ^{2}}

\frac{d x}{d x} = 1

\frac{d}{d x} (x^{2} - 8) = 2 x

= \frac{1 \cdot ( x ^{2} - 8 ) - 2 xx}{( x ^{2} - 8 ) ^{2}}

1 \cdot (x^{2} - 8) - 2 xx = - x^{2} - 8

= \frac{- x ^{2} - 8}{( x ^{2} - 8 ) ^{2}}