x^2-11.2x+31.36=0

解

x^{2} - 11.2 x + 31.36 = 0

x = \frac{28}{5}

十進法表記

x = 5.6

解答ステップ

x^{2} - 11.2 x + 31.36 = 0

以下で両辺を乗じる:

100

100 x^{2} - 1120 x + 3136 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 1120 ) \pm ( - 1120 ) ^{2} - 4 \cdot 100 \cdot 3136}{2 \cdot 100}

(- 1120)^{2} - 4 \cdot 100 \cdot 3136 = 0

x_{1, 2} = \frac{- ( - 1120 ) \pm 0}{2 \cdot 100}

x = \frac{- ( - 1120 )}{2 \cdot 100}

\frac{- ( - 1120 )}{2 \cdot 100} = \frac{28}{5}

x = \frac{28}{5}

二次equationの解:

x = \frac{28}{5}