(x^2)/(90)+(19x)/(90)+1=0

解

\frac{x ^{2}}{90} + \frac{19 x}{90} + 1 = 0

x = - 9, x = - 10

解答ステップ

\frac{x ^{2}}{90} + \frac{19 x}{90} + 1 = 0

以下で両辺を乗じる:

90

x^{2} + 19 x + 90 = 0

解くとthe二次式

x_{1, 2} = \frac{- 19 \pm 1 9 ^{2} - 4 \cdot 1 \cdot 90}{2 \cdot 1}

1 9^{2} - 4 \cdot 1 \cdot 90 = 1

x_{1, 2} = \frac{- 19 \pm 1}{2 \cdot 1}

解を分離する

x_{1} = \frac{- 19 + 1}{2 \cdot 1}, x_{2} = \frac{- 19 - 1}{2 \cdot 1}

x = \frac{- 19 + 1}{2 \cdot 1} : - 9

x = \frac{- 19 - 1}{2 \cdot 1} : - 10

二次equationの解:

x = - 9, x = - 10