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人気のある代数 >

7x^2-7x+1=0

解

7 x^{2} - 7 x + 1 = 0

解

x = \frac{7 + 21}{14}, x = \frac{7 - 21}{14}

+1

十進法表記

x = 0.82732 \dots, x = 0.17267 \dots

解答ステップ

7 x^{2} - 7 x + 1 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 7 ) \pm ( - 7 ) ^{2} - 4 \cdot 7 \cdot 1}{2 \cdot 7}

(- 7)^{2} - 4 \cdot 7 \cdot 1 = 21

x_{1, 2} = \frac{- ( - 7 ) \pm 21}{2 \cdot 7}

解を分離する

x_{1} = \frac{- ( - 7 ) + 21}{2 \cdot 7}, x_{2} = \frac{- ( - 7 ) - 21}{2 \cdot 7}

x = \frac{- ( - 7 ) + 21}{2 \cdot 7} : \frac{7 + 21}{14}

x = \frac{- ( - 7 ) - 21}{2 \cdot 7} : \frac{7 - 21}{14}

二次equationの解:

x = \frac{7 + 21}{14}, x = \frac{7 - 21}{14}

グラフ

人気の例

4 u^{2} + 24 u + 4 = 0

z^{2} - 10 z + 34 = 0

1-7/30 x-1/15 x^2=0

1 - \frac{7}{30} x - \frac{1}{15} x^{2} = 0

(x + 9) (x - 3) = 0

solvefor a,9a^2-a^2=c^2

so l v e f or a, 9 a^{2} - a^{2} = c^{2}