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受欢迎的代数 >

x^2+14x+18=0

解答

x^{2} + 14 x + 18 = 0

解答

x = - 7 + 31, x = - 7 - 31

+1

十进制

x = - 1.43223 \dots, x = - 12.56776 \dots

求解步骤

x^{2} + 14 x + 18 = 0

使用求根公式求解

x_{1, 2} = \frac{- 14 \pm 1 4 ^{2} - 4 \cdot 1 \cdot 18}{2 \cdot 1}

1 4^{2} - 4 \cdot 1 \cdot 18 = 231

x_{1, 2} = \frac{- 14 \pm 2 31}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 14 + 2 31}{2 \cdot 1}, x_{2} = \frac{- 14 - 2 31}{2 \cdot 1}

x = \frac{- 14 + 2 31}{2 \cdot 1} : - 7 + 31

x = \frac{- 14 - 2 31}{2 \cdot 1} : - 7 - 31

二次方程组的解是:

x = - 7 + 31, x = - 7 - 31

作图

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