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受欢迎的代数 >

x^2-(a+2)x+2a=0

解答

x^{2} - (a + 2) x + 2 a = 0

解答

x = a, x = 2

求解步骤

x^{2} - (a + 2) x + 2 a = 0

使用求根公式求解

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

化简

(- a - 2)^{2} - 4 \cdot 1 \cdot 2 a : a - 2

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

将解分隔开

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

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

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

二次方程组的解是:

x = a, x = 2

作图

流行的例子

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