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受欢迎的代数 >

x^2-x-210=0

解答

x^{2} - x - 210 = 0

解答

x = 15, x = - 14

求解步骤

x^{2} - x - 210 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 1 ) \pm ( - 1 ) ^{2} - 4 \cdot 1 \cdot ( - 210 )}{2 \cdot 1}

(- 1)^{2} - 4 \cdot 1 \cdot (- 210) = 29

x_{1, 2} = \frac{- ( - 1 ) \pm 29}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- ( - 1 ) + 29}{2 \cdot 1}, x_{2} = \frac{- ( - 1 ) - 29}{2 \cdot 1}

x = \frac{- ( - 1 ) + 29}{2 \cdot 1} : 15

x = \frac{- ( - 1 ) - 29}{2 \cdot 1} : - 14

二次方程组的解是:

x = 15, x = - 14

作图

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