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受欢迎的代数 >

0=2x^2-12x-30

解答

0 = 2 x^{2} - 12 x - 30

解答

x = 3 + 26, x = 3 - 26

+1

十进制

x = 7.89897 \dots, x = - 1.89897 \dots

求解步骤

0 = 2 x^{2} - 12 x - 30

交换两边

2 x^{2} - 12 x - 30 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 12 ) \pm ( - 12 ) ^{2} - 4 \cdot 2 ( - 30 )}{2 \cdot 2}

(- 12)^{2} - 4 \cdot 2 (- 30) = 86

x_{1, 2} = \frac{- ( - 12 ) \pm 8 6}{2 \cdot 2}

将解分隔开

x_{1} = \frac{- ( - 12 ) + 8 6}{2 \cdot 2}, x_{2} = \frac{- ( - 12 ) - 8 6}{2 \cdot 2}

x = \frac{- ( - 12 ) + 8 6}{2 \cdot 2} : 3 + 26

x = \frac{- ( - 12 ) - 8 6}{2 \cdot 2} : 3 - 26

二次方程组的解是:

x = 3 + 26, x = 3 - 26

作图

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