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受欢迎的代数 >

x^2+8x=-12+0

解答

x^{2} + 8 x = - 12 + 0

解答

x = - 2, x = - 6

求解步骤

x^{2} + 8 x = - 12 + 0

整理后得

x^{2} + 8 x = - 12

将

12

para o lado esquerdo

x^{2} + 8 x + 12 = 0

使用求根公式求解

x_{1, 2} = \frac{- 8 \pm 8 ^{2} - 4 \cdot 1 \cdot 12}{2 \cdot 1}

8^{2} - 4 \cdot 1 \cdot 12 = 4

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

将解分隔开

x_{1} = \frac{- 8 + 4}{2 \cdot 1}, x_{2} = \frac{- 8 - 4}{2 \cdot 1}

x = \frac{- 8 + 4}{2 \cdot 1} : - 2

x = \frac{- 8 - 4}{2 \cdot 1} : - 6

二次方程组的解是:

x = - 2, x = - 6

作图

流行的例子

- 2 x^{2} + 5 x + 8 = 0

5 x^{2} + 29 x + 20 = 0

solvefor y=x^2-9x+20,x

so l v e f or y = x^{2} - 9 x + 20, x

(x+1)(8x+1)=18x

(x + 1) (8 x + 1) = 18 x

81 - x^{2} = 2 x^{2}