quadraticformula x^2-14x=-45

解

x^{2} - 14 x = - 45

x = 9, x = 5

解答ステップ

x^{2} - 14 x = - 45

45

を左側に移動します

x^{2} - 14 x + 45 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 14 ) \pm ( - 14 ) ^{2} - 4 \cdot 1 \cdot 45}{2 \cdot 1}

(- 14)^{2} - 4 \cdot 1 \cdot 45 = 4

x_{1, 2} = \frac{- ( - 14 ) \pm 4}{2 \cdot 1}

解を分離する

x_{1} = \frac{- ( - 14 ) + 4}{2 \cdot 1}, x_{2} = \frac{- ( - 14 ) - 4}{2 \cdot 1}

x = \frac{- ( - 14 ) + 4}{2 \cdot 1} : 9

x = \frac{- ( - 14 ) - 4}{2 \cdot 1} : 5

二次equationの解:

x = 9, x = 5