2x^2-28x=-98

解

2 x^{2} - 28 x = - 98

x = 7

解答ステップ

2 x^{2} - 28 x = - 98

98

を左側に移動します

2 x^{2} - 28 x + 98 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 28 ) \pm ( - 28 ) ^{2} - 4 \cdot 2 \cdot 98}{2 \cdot 2}

(- 28)^{2} - 4 \cdot 2 \cdot 98 = 0

x_{1, 2} = \frac{- ( - 28 ) \pm 0}{2 \cdot 2}

x = \frac{- ( - 28 )}{2 \cdot 2}

\frac{- ( - 28 )}{2 \cdot 2} = 7

x = 7

二次equationの解:

x = 7