quadraticformula x^2-9x=10

解

x^{2} - 9 x = 10

x = 10, x = - 1

解答ステップ

x^{2} - 9 x = 10

10

を左側に移動します

x^{2} - 9 x - 10 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 9 ) \pm ( - 9 ) ^{2} - 4 \cdot 1 \cdot ( - 10 )}{2 \cdot 1}

(- 9)^{2} - 4 \cdot 1 \cdot (- 10) = 11

x_{1, 2} = \frac{- ( - 9 ) \pm 11}{2 \cdot 1}

解を分離する

x_{1} = \frac{- ( - 9 ) + 11}{2 \cdot 1}, x_{2} = \frac{- ( - 9 ) - 11}{2 \cdot 1}

x = \frac{- ( - 9 ) + 11}{2 \cdot 1} : 10

x = \frac{- ( - 9 ) - 11}{2 \cdot 1} : - 1

二次equationの解:

x = 10, x = - 1