a^2-9a+8=0

解

a^{2} - 9 a + 8 = 0

a = 8, a = 1

解答ステップ

a^{2} - 9 a + 8 = 0

解くとthe二次式

a_{1, 2} = \frac{- ( - 9 ) \pm ( - 9 ) ^{2} - 4 \cdot 1 \cdot 8}{2 \cdot 1}

(- 9)^{2} - 4 \cdot 1 \cdot 8 = 7

a_{1, 2} = \frac{- ( - 9 ) \pm 7}{2 \cdot 1}

解を分離する

a_{1} = \frac{- ( - 9 ) + 7}{2 \cdot 1}, a_{2} = \frac{- ( - 9 ) - 7}{2 \cdot 1}

a = \frac{- ( - 9 ) + 7}{2 \cdot 1} : 8

a = \frac{- ( - 9 ) - 7}{2 \cdot 1} : 1

二次equationの解:

a = 8, a = 1