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受欢迎的代数 >

(x^2+5x-3)=(x+2)

解答

(x^{2} + 5 x - 3) = (x + 2)

解答

x = 1, x = - 5

求解步骤

(x^{2} + 5 x - 3) = (x + 2)

整理后得

x^{2} + 5 x - 3 = x + 2

将

2

para o lado esquerdo

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

将

x

para o lado esquerdo

x^{2} + 4 x - 5 = 0

使用求根公式求解

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

4^{2} - 4 \cdot 1 \cdot (- 5) = 6

x_{1, 2} = \frac{- 4 \pm 6}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 4 + 6}{2 \cdot 1}, x_{2} = \frac{- 4 - 6}{2 \cdot 1}

x = \frac{- 4 + 6}{2 \cdot 1} : 1

x = \frac{- 4 - 6}{2 \cdot 1} : - 5

二次方程组的解是:

x = 1, x = - 5

作图

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