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受欢迎的代数 >

x^2+4x-36=0

解答

x^{2} + 4 x - 36 = 0

解答

x = 2 (10 - 1), x = - 2 (1 + 10)

+1

十进制

x = 4.32455 \dots, x = - 8.32455 \dots

求解步骤

x^{2} + 4 x - 36 = 0

使用求根公式求解

x_{1, 2} = \frac{- 4 \pm 4 ^{2} - 4 \cdot 1 \cdot ( - 36 )}{2 \cdot 1}

4^{2} - 4 \cdot 1 \cdot (- 36) = 410

x_{1, 2} = \frac{- 4 \pm 4 10}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 4 + 4 10}{2 \cdot 1}, x_{2} = \frac{- 4 - 4 10}{2 \cdot 1}

x = \frac{- 4 + 4 10}{2 \cdot 1} : 2 (10 - 1)

x = \frac{- 4 - 4 10}{2 \cdot 1} : - 2 (1 + 10)

二次方程组的解是:

x = 2 (10 - 1), x = - 2 (1 + 10)

作图

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