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人気のある代数 >

7x^2-28x+1=0

解

7 x^{2} - 28 x + 1 = 0

解

x = \frac{14 + 3 21}{7}, x = \frac{14 - 3 21}{7}

+1

十進法表記

x = 3.96396 \dots, x = 0.03603 \dots

解答ステップ

7 x^{2} - 28 x + 1 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 28 ) \pm ( - 28 ) ^{2} - 4 \cdot 7 \cdot 1}{2 \cdot 7}

(- 28)^{2} - 4 \cdot 7 \cdot 1 = 621

x_{1, 2} = \frac{- ( - 28 ) \pm 6 21}{2 \cdot 7}

解を分離する

x_{1} = \frac{- ( - 28 ) + 6 21}{2 \cdot 7}, x_{2} = \frac{- ( - 28 ) - 6 21}{2 \cdot 7}

x = \frac{- ( - 28 ) + 6 21}{2 \cdot 7} : \frac{14 + 3 21}{7}

x = \frac{- ( - 28 ) - 6 21}{2 \cdot 7} : \frac{14 - 3 21}{7}

二次equationの解:

x = \frac{14 + 3 21}{7}, x = \frac{14 - 3 21}{7}

グラフ

人気の例

completesquare x^2+14x-15=0

co m pl e t es q u a re x^{2} + 14 x - 15 = 0

X^{2} + 9 = 0

x^2-4/3 x+4/9 =0

x^{2} - \frac{4}{3} x + \frac{4}{9} = 0

4 x^{2} = - 2

x (x + 3) - 40 = 0