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受欢迎的代数 >

(x+a)(x-b)=x^2+2x-48

解答

(x + a) (x - b) = x^{2} + 2 x - 48

解答

x = \frac{- 48 + ab}{a - b - 2}; a \neq = b + 2

求解步骤

(x + a) (x - b) = x^{2} + 2 x - 48

展开

(x + a) (x - b) : x^{2} - b x + a x - ab

x^{2} - b x + a x - ab = x^{2} + 2 x - 48

将

ab

到右边

x^{2} - b x + a x = x^{2} + 2 x - 48 + ab

两边减去

x^{2} + 2 x

x^{2} - b x + a x - (x^{2} + 2 x) = x^{2} + 2 x - 48 + ab - (x^{2} + 2 x)

化简

a x - b x - 2 x = - 48 + ab

分解

a x - b x - 2 x : x (a - b - 2)

x (a - b - 2) = - 48 + ab

两边除以

a - b - 2; a \neq = b + 2

x = \frac{- 48 + ab}{a - b - 2}; a \neq = b + 2

作图

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