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受欢迎的代数 >

x^2+12x-27=0

解答

x^{2} + 12 x - 27 = 0

解答

x = 3 (7 - 2), x = - 3 (2 + 7)

+1

十进制

x = 1.93725 \dots, x = - 13.93725 \dots

求解步骤

x^{2} + 12 x - 27 = 0

使用求根公式求解

x_{1, 2} = \frac{- 12 \pm 1 2 ^{2} - 4 \cdot 1 \cdot ( - 27 )}{2 \cdot 1}

1 2^{2} - 4 \cdot 1 \cdot (- 27) = 67

x_{1, 2} = \frac{- 12 \pm 6 7}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 12 + 6 7}{2 \cdot 1}, x_{2} = \frac{- 12 - 6 7}{2 \cdot 1}

x = \frac{- 12 + 6 7}{2 \cdot 1} : 3 (7 - 2)

x = \frac{- 12 - 6 7}{2 \cdot 1} : - 3 (2 + 7)

二次方程组的解是:

x = 3 (7 - 2), x = - 3 (2 + 7)

作图

流行的例子

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