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人気のある代数 >

2+x-15x^2=0

解

2 + x - 15 x^{2} = 0

解

x = - \frac{1}{3}, x = \frac{2}{5}

+1

十進法表記

x = - 0.33333 \dots, x = 0.4

解答ステップ

2 + x - 15 x^{2} = 0

標準的な形式で書く

a x^{2} + b x + c = 0

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

解くとthe二次式

x_{1, 2} = \frac{- 1 \pm 1 ^{2} - 4 ( - 15 ) \cdot 2}{2 ( - 15 )}

1^{2} - 4 (- 15) \cdot 2 = 11

x_{1, 2} = \frac{- 1 \pm 11}{2 ( - 15 )}

解を分離する

x_{1} = \frac{- 1 + 11}{2 ( - 15 )}, x_{2} = \frac{- 1 - 11}{2 ( - 15 )}

x = \frac{- 1 + 11}{2 ( - 15 )} : - \frac{1}{3}

x = \frac{- 1 - 11}{2 ( - 15 )} : \frac{2}{5}

二次equationの解:

x = - \frac{1}{3}, x = \frac{2}{5}

グラフ

人気の例

70 x - x^{2} = 100

3 x^{2} - 18 x + 10 = 0

\frac{1}{2} t^{2} + 9 = 6 t

2 b^{2} - 16 = 56

2 x^{2} + x - 16 = 0