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受欢迎的代数 >

3-14x-5x^2=0

解答

3 - 14 x - 5 x^{2} = 0

解答

x = - 3, x = \frac{1}{5}

+1

十进制

x = - 3, x = 0.2

求解步骤

3 - 14 x - 5 x^{2} = 0

改写成标准形式

a x^{2} + b x + c = 0

- 5 x^{2} - 14 x + 3 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 14 ) \pm ( - 14 ) ^{2} - 4 ( - 5 ) \cdot 3}{2 ( - 5 )}

(- 14)^{2} - 4 (- 5) \cdot 3 = 16

x_{1, 2} = \frac{- ( - 14 ) \pm 16}{2 ( - 5 )}

将解分隔开

x_{1} = \frac{- ( - 14 ) + 16}{2 ( - 5 )}, x_{2} = \frac{- ( - 14 ) - 16}{2 ( - 5 )}

x = \frac{- ( - 14 ) + 16}{2 ( - 5 )} : - 3

x = \frac{- ( - 14 ) - 16}{2 ( - 5 )} : \frac{1}{5}

二次方程组的解是:

x = - 3, x = \frac{1}{5}

作图

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