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受欢迎的代数 >

x^2+4=-2x+3

解答

x^{2} + 4 = - 2 x + 3

解答

x = - 1

求解步骤

x^{2} + 4 = - 2 x + 3

将

3

para o lado esquerdo

x^{2} + 1 = - 2 x

将

2 x

para o lado esquerdo

x^{2} + 1 + 2 x = 0

改写成标准形式

a x^{2} + b x + c = 0

x^{2} + 2 x + 1 = 0

使用求根公式求解

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

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

x_{1, 2} = \frac{- 2 \pm 0}{2 \cdot 1}

x = \frac{- 2}{2 \cdot 1}

\frac{- 2}{2 \cdot 1} = - 1

x = - 1

二次方程组的解是:

x = - 1

作图

流行的例子

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

(x+3)^2-2=2x(x+2)+x+8

(x + 3)^{2} - 2 = 2 x (x + 2) + x + 8

x^{2} + 71 = 18 x - 9

(y+7)^2=2y^2+17+39

(y + 7)^{2} = 2 y^{2} + 17 + 39

solvefor x,y^2-x^2=c

so l v e f or x, y^{2} - x^{2} = c