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受欢迎的代数 >

2x^2+11x-138=0

解答

2 x^{2} + 11 x - 138 = 0

解答

x = 6, x = - \frac{23}{2}

+1

十进制

x = 6, x = - 11.5

求解步骤

2 x^{2} + 11 x - 138 = 0

使用求根公式求解

x_{1, 2} = \frac{- 11 \pm 1 1 ^{2} - 4 \cdot 2 ( - 138 )}{2 \cdot 2}

1 1^{2} - 4 \cdot 2 (- 138) = 35

x_{1, 2} = \frac{- 11 \pm 35}{2 \cdot 2}

将解分隔开

x_{1} = \frac{- 11 + 35}{2 \cdot 2}, x_{2} = \frac{- 11 - 35}{2 \cdot 2}

x = \frac{- 11 + 35}{2 \cdot 2} : 6

x = \frac{- 11 - 35}{2 \cdot 2} : - \frac{23}{2}

二次方程组的解是:

x = 6, x = - \frac{23}{2}

作图

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