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受欢迎的代数 >

x^2-4x-30=0

解答

x^{2} - 4 x - 30 = 0

解答

x = 2 + 34, x = 2 - 34

+1

十进制

x = 7.83095 \dots, x = - 3.83095 \dots

求解步骤

x^{2} - 4 x - 30 = 0

使用求根公式求解

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

(- 4)^{2} - 4 \cdot 1 \cdot (- 30) = 234

x_{1, 2} = \frac{- ( - 4 ) \pm 2 34}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- ( - 4 ) + 2 34}{2 \cdot 1}, x_{2} = \frac{- ( - 4 ) - 2 34}{2 \cdot 1}

x = \frac{- ( - 4 ) + 2 34}{2 \cdot 1} : 2 + 34

x = \frac{- ( - 4 ) - 2 34}{2 \cdot 1} : 2 - 34

二次方程组的解是:

x = 2 + 34, x = 2 - 34

作图

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