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受欢迎的代数 >

x^2-4=-(4-2x)

解答

x^{2} - 4 = - (4 - 2 x)

解答

x = 2, x = 0

求解步骤

x^{2} - 4 = - (4 - 2 x)

展开

- (4 - 2 x) : - 4 + 2 x

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

将

2 x

para o lado esquerdo

x^{2} - 4 - 2 x = - 4

将

4

para o lado esquerdo

x^{2} - 2 x = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 2 ) \pm ( - 2 ) ^{2} - 4 \cdot 1 \cdot 0}{2 \cdot 1}

(- 2)^{2} - 4 \cdot 1 \cdot 0 = 2

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

将解分隔开

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

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

x = \frac{- ( - 2 ) - 2}{2 \cdot 1} : 0

二次方程组的解是:

x = 2, x = 0

作图

流行的例子

x (x - 16) + 63 = 0

solvefor q,p=2q^2

so l v e f or q, p = 2 q^{2}

solvefor d,a*[a+d]*[a+2d]=16

so l v e f or d, a \cdot [a + d] \cdot [a + 2 d] = 16

7 m^{2} + 2 = 170

x^{2} + 89 = - 20 x