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受欢迎的代数 >

x^2-7x=7

解答

x^{2} - 7 x = 7

解答

x = \frac{7 + 77}{2}, x = \frac{7 - 77}{2}

+1

十进制

x = 7.88748 \dots, x = - 0.88748 \dots

求解步骤

x^{2} - 7 x = 7

将

7

para o lado esquerdo

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

使用求根公式求解

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

(- 7)^{2} - 4 \cdot 1 \cdot (- 7) = 77

x_{1, 2} = \frac{- ( - 7 ) \pm 77}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- ( - 7 ) + 77}{2 \cdot 1}, x_{2} = \frac{- ( - 7 ) - 77}{2 \cdot 1}

x = \frac{- ( - 7 ) + 77}{2 \cdot 1} : \frac{7 + 77}{2}

x = \frac{- ( - 7 ) - 77}{2 \cdot 1} : \frac{7 - 77}{2}

二次方程组的解是:

x = \frac{7 + 77}{2}, x = \frac{7 - 77}{2}

作图

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