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受欢迎的代数 >

x^2+5x-104=0

解答

x^{2} + 5 x - 104 = 0

解答

x = 8, x = - 13

求解步骤

x^{2} + 5 x - 104 = 0

使用求根公式求解

x_{1, 2} = \frac{- 5 \pm 5 ^{2} - 4 \cdot 1 \cdot ( - 104 )}{2 \cdot 1}

5^{2} - 4 \cdot 1 \cdot (- 104) = 21

x_{1, 2} = \frac{- 5 \pm 21}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 5 + 21}{2 \cdot 1}, x_{2} = \frac{- 5 - 21}{2 \cdot 1}

x = \frac{- 5 + 21}{2 \cdot 1} : 8

x = \frac{- 5 - 21}{2 \cdot 1} : - 13

二次方程组的解是:

x = 8, x = - 13

作图

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