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受欢迎的代数 >

x^2+7=6x

解答

x^{2} + 7 = 6 x

解答

x = 3 + 2, x = 3 - 2

+1

十进制

x = 4.41421 \dots, x = 1.58578 \dots

求解步骤

x^{2} + 7 = 6 x

将

6 x

para o lado esquerdo

x^{2} + 7 - 6 x = 0

改写成标准形式

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

x^{2} - 6 x + 7 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 6 ) \pm ( - 6 ) ^{2} - 4 \cdot 1 \cdot 7}{2 \cdot 1}

(- 6)^{2} - 4 \cdot 1 \cdot 7 = 22

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

将解分隔开

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

x = \frac{- ( - 6 ) + 2 2}{2 \cdot 1} : 3 + 2

x = \frac{- ( - 6 ) - 2 2}{2 \cdot 1} : 3 - 2

二次方程组的解是:

x = 3 + 2, x = 3 - 2

作图

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