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受欢迎的代数 >

4x^2+20x-11=0

解答

4 x^{2} + 20 x - 11 = 0

解答

x = \frac{1}{2}, x = - \frac{11}{2}

+1

十进制

x = 0.5, x = - 5.5

求解步骤

4 x^{2} + 20 x - 11 = 0

使用求根公式求解

x_{1, 2} = \frac{- 20 \pm 2 0 ^{2} - 4 \cdot 4 ( - 11 )}{2 \cdot 4}

2 0^{2} - 4 \cdot 4 (- 11) = 24

x_{1, 2} = \frac{- 20 \pm 24}{2 \cdot 4}

将解分隔开

x_{1} = \frac{- 20 + 24}{2 \cdot 4}, x_{2} = \frac{- 20 - 24}{2 \cdot 4}

x = \frac{- 20 + 24}{2 \cdot 4} : \frac{1}{2}

x = \frac{- 20 - 24}{2 \cdot 4} : - \frac{11}{2}

二次方程组的解是:

x = \frac{1}{2}, x = - \frac{11}{2}

作图

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