quadraticformula x^2-5x+5=0

解

x^{2} - 5 x + 5 = 0

x = \frac{5 + 5}{2}, x = \frac{5 - 5}{2}

十進法表記

x = 3.61803 \dots, x = 1.38196 \dots

解答ステップ

x^{2} - 5 x + 5 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 5 ) \pm ( - 5 ) ^{2} - 4 \cdot 1 \cdot 5}{2 \cdot 1}

(- 5)^{2} - 4 \cdot 1 \cdot 5 = 5

x_{1, 2} = \frac{- ( - 5 ) \pm 5}{2 \cdot 1}

解を分離する

x_{1} = \frac{- ( - 5 ) + 5}{2 \cdot 1}, x_{2} = \frac{- ( - 5 ) - 5}{2 \cdot 1}

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

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

二次equationの解:

x = \frac{5 + 5}{2}, x = \frac{5 - 5}{2}