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受欢迎的代数 >

8x^2=-2+17x

解答

8 x^{2} = - 2 + 17 x

解答

x = 2, x = \frac{1}{8}

+1

十进制

x = 2, x = 0.125

求解步骤

8 x^{2} = - 2 + 17 x

将

17 x

para o lado esquerdo

8 x^{2} - 17 x = - 2

将

2

para o lado esquerdo

8 x^{2} - 17 x + 2 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 17 ) \pm ( - 17 ) ^{2} - 4 \cdot 8 \cdot 2}{2 \cdot 8}

(- 17)^{2} - 4 \cdot 8 \cdot 2 = 15

x_{1, 2} = \frac{- ( - 17 ) \pm 15}{2 \cdot 8}

将解分隔开

x_{1} = \frac{- ( - 17 ) + 15}{2 \cdot 8}, x_{2} = \frac{- ( - 17 ) - 15}{2 \cdot 8}

x = \frac{- ( - 17 ) + 15}{2 \cdot 8} : 2

x = \frac{- ( - 17 ) - 15}{2 \cdot 8} : \frac{1}{8}

二次方程组的解是:

x = 2, x = \frac{1}{8}

作图

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