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受欢迎的代数 >

5x^2+6x-25=0

解答

5 x^{2} + 6 x - 25 = 0

解答

x = \frac{- 3 + 134}{5}, x = - \frac{3 + 134}{5}

+1

十进制

x = 1.71516 \dots, x = - 2.91516 \dots

求解步骤

5 x^{2} + 6 x - 25 = 0

使用求根公式求解

x_{1, 2} = \frac{- 6 \pm 6 ^{2} - 4 \cdot 5 ( - 25 )}{2 \cdot 5}

6^{2} - 4 \cdot 5 (- 25) = 2134

x_{1, 2} = \frac{- 6 \pm 2 134}{2 \cdot 5}

将解分隔开

x_{1} = \frac{- 6 + 2 134}{2 \cdot 5}, x_{2} = \frac{- 6 - 2 134}{2 \cdot 5}

x = \frac{- 6 + 2 134}{2 \cdot 5} : \frac{- 3 + 134}{5}

x = \frac{- 6 - 2 134}{2 \cdot 5} : - \frac{3 + 134}{5}

二次方程组的解是:

x = \frac{- 3 + 134}{5}, x = - \frac{3 + 134}{5}

作图

流行的例子

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