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受欢迎的代数 >

-4x^2-4x+5=0

解答

- 4 x^{2} - 4 x + 5 = 0

解答

x = - \frac{1 + 6}{2}, x = \frac{6 - 1}{2}

+1

十进制

x = - 1.72474 \dots, x = 0.72474 \dots

求解步骤

- 4 x^{2} - 4 x + 5 = 0

使用求根公式求解

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

(- 4)^{2} - 4 (- 4) \cdot 5 = 46

x_{1, 2} = \frac{- ( - 4 ) \pm 4 6}{2 ( - 4 )}

将解分隔开

x_{1} = \frac{- ( - 4 ) + 4 6}{2 ( - 4 )}, x_{2} = \frac{- ( - 4 ) - 4 6}{2 ( - 4 )}

x = \frac{- ( - 4 ) + 4 6}{2 ( - 4 )} : - \frac{1 + 6}{2}

x = \frac{- ( - 4 ) - 4 6}{2 ( - 4 )} : \frac{6 - 1}{2}

二次方程组的解是:

x = - \frac{1 + 6}{2}, x = \frac{6 - 1}{2}

作图

流行的例子

completesquare x^2+7x+18

co m pl e t es q u a re x^{2} + 7 x + 18

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