9x^2-72x=0

解

9 x^{2} - 72 x = 0

x = 8, x = 0

解答ステップ

9 x^{2} - 72 x = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 72 ) \pm ( - 72 ) ^{2} - 4 \cdot 9 \cdot 0}{2 \cdot 9}

(- 72)^{2} - 4 \cdot 9 \cdot 0 = 72

x_{1, 2} = \frac{- ( - 72 ) \pm 72}{2 \cdot 9}

解を分離する

x_{1} = \frac{- ( - 72 ) + 72}{2 \cdot 9}, x_{2} = \frac{- ( - 72 ) - 72}{2 \cdot 9}

x = \frac{- ( - 72 ) + 72}{2 \cdot 9} : 8

x = \frac{- ( - 72 ) - 72}{2 \cdot 9} : 0

二次equationの解:

x = 8, x = 0