derivative of (x^2-10x+9/((x-5)^2))

解

\frac{d}{d x} (\frac{x ^{2} - 10 x + 9}{( x - 5 ) ^{2}})

\frac{32}{( x - 5 ) ^{3}}

解答ステップ

\frac{d}{d x} (\frac{x ^{2} - 10 x + 9}{( x - 5 ) ^{2}})

商の法則を適用:

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

= \frac{\frac{d}{d x} ( x ^{2} - 10 x + 9 ) ( x - 5 ) ^{2} - \frac{d}{d x} ( ( x - 5 ) ^{2} ) ( x ^{2} - 10 x + 9 )}{( ( x - 5 ) ^{2} ) ^{2}}

\frac{d}{d x} (x^{2} - 10 x + 9) = 2 x - 10

\frac{d}{d x} ((x - 5)^{2}) = 2 (x - 5)

= \frac{( 2 x - 10 ) ( x - 5 ) ^{2} - 2 ( x - 5 ) ( x ^{2} - 10 x + 9 )}{( ( x - 5 ) ^{2} ) ^{2}}

簡素化

\frac{( 2 x - 10 ) ( x - 5 ) ^{2} - 2 ( x - 5 ) ( x ^{2} - 10 x + 9 )}{( ( x - 5 ) ^{2} ) ^{2}} : \frac{32}{( x - 5 ) ^{3}}

= \frac{32}{( x - 5 ) ^{3}}