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受欢迎的代数 >

2x^2+36=-18x

解答

2 x^{2} + 36 = - 18 x

解答

x = - 3, x = - 6

求解步骤

2 x^{2} + 36 = - 18 x

将

18 x

para o lado esquerdo

2 x^{2} + 36 + 18 x = 0

改写成标准形式

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

2 x^{2} + 18 x + 36 = 0

使用求根公式求解

x_{1, 2} = \frac{- 18 \pm 1 8 ^{2} - 4 \cdot 2 \cdot 36}{2 \cdot 2}

1 8^{2} - 4 \cdot 2 \cdot 36 = 6

x_{1, 2} = \frac{- 18 \pm 6}{2 \cdot 2}

将解分隔开

x_{1} = \frac{- 18 + 6}{2 \cdot 2}, x_{2} = \frac{- 18 - 6}{2 \cdot 2}

x = \frac{- 18 + 6}{2 \cdot 2} : - 3

x = \frac{- 18 - 6}{2 \cdot 2} : - 6

二次方程组的解是:

x = - 3, x = - 6

作图

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