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受欢迎的代数 >

-2x^2-20x-22=0

解答

- 2 x^{2} - 20 x - 22 = 0

解答

x = - 5 - 14, x = - 5 + 14

+1

十进制

x = - 8.74165 \dots, x = - 1.25834 \dots

求解步骤

- 2 x^{2} - 20 x - 22 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 20 ) \pm ( - 20 ) ^{2} - 4 ( - 2 ) ( - 22 )}{2 ( - 2 )}

(- 20)^{2} - 4 (- 2) (- 22) = 414

x_{1, 2} = \frac{- ( - 20 ) \pm 4 14}{2 ( - 2 )}

将解分隔开

x_{1} = \frac{- ( - 20 ) + 4 14}{2 ( - 2 )}, x_{2} = \frac{- ( - 20 ) - 4 14}{2 ( - 2 )}

x = \frac{- ( - 20 ) + 4 14}{2 ( - 2 )} : - 5 - 14

x = \frac{- ( - 20 ) - 4 14}{2 ( - 2 )} : - 5 + 14

二次方程组的解是:

x = - 5 - 14, x = - 5 + 14

作图

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