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受欢迎的代数 >

x^2-3ax-28a^2=0

解答

x^{2} - 3 a x - 28 a^{2} = 0

解答

x = 7 a, x = - 4 a

求解步骤

x^{2} - 3 a x - 28 a^{2} = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 3 a ) \pm ( - 3 a ) ^{2} - 4 \cdot 1 \cdot ( - 28 a ^{2} )}{2 \cdot 1}

化简

(- 3 a)^{2} - 4 \cdot 1 \cdot (- 28 a^{2}) : 11 a

x_{1, 2} = \frac{- ( - 3 a ) \pm 11 a}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- ( - 3 a ) + 11 a}{2 \cdot 1}, x_{2} = \frac{- ( - 3 a ) - 11 a}{2 \cdot 1}

x = \frac{- ( - 3 a ) + 11 a}{2 \cdot 1} : 7 a

x = \frac{- ( - 3 a ) - 11 a}{2 \cdot 1} : - 4 a

二次方程组的解是:

x = 7 a, x = - 4 a

作图

流行的例子

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so l v e f or y, 3 x^{2} - y^{2} = 5 x^{3} y^{2} - 4

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so l v e f or x, 3 x^{2} - 8 x + 4 = 0

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