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受欢迎的代数 >

x^2+8x+4=-3

解答

x^{2} + 8 x + 4 = - 3

解答

x = - 1, x = - 7

求解步骤

x^{2} + 8 x + 4 = - 3

将

3

para o lado esquerdo

x^{2} + 8 x + 7 = 0

使用求根公式求解

x_{1, 2} = \frac{- 8 \pm 8 ^{2} - 4 \cdot 1 \cdot 7}{2 \cdot 1}

8^{2} - 4 \cdot 1 \cdot 7 = 6

x_{1, 2} = \frac{- 8 \pm 6}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 8 + 6}{2 \cdot 1}, x_{2} = \frac{- 8 - 6}{2 \cdot 1}

x = \frac{- 8 + 6}{2 \cdot 1} : - 1

x = \frac{- 8 - 6}{2 \cdot 1} : - 7

二次方程组的解是:

x = - 1, x = - 7

作图

流行的例子

x^{2} + 10 x + 32 = 11

solvefor x,x^2-y^2-z^2=5

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

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

5 x^{2} = - 11

- 4 x^{2} + 32 x - 64 = 0