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受欢迎的代数 >

-2x^2-4x+8=0

解答

- 2 x^{2} - 4 x + 8 = 0

解答

x = - 1 - 5, x = 5 - 1

+1

十进制

x = - 3.23606 \dots, x = 1.23606 \dots

求解步骤

- 2 x^{2} - 4 x + 8 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 4 ) \pm ( - 4 ) ^{2} - 4 ( - 2 ) \cdot 8}{2 ( - 2 )}

(- 4)^{2} - 4 (- 2) \cdot 8 = 45

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

将解分隔开

x_{1} = \frac{- ( - 4 ) + 4 5}{2 ( - 2 )}, x_{2} = \frac{- ( - 4 ) - 4 5}{2 ( - 2 )}

x = \frac{- ( - 4 ) + 4 5}{2 ( - 2 )} : - 1 - 5

x = \frac{- ( - 4 ) - 4 5}{2 ( - 2 )} : 5 - 1

二次方程组的解是:

x = - 1 - 5, x = 5 - 1

作图

流行的例子

(x + 2)^{2} + 10 = 26

因式分解 5x^2+11x+2=0

f a c t or 5 x^{2} + 11 x + 2 = 0

39=-((x^2)/(200))+x-2

39 = - (\frac{x ^{2}}{200}) + x - 2

x^2-15/81 = 539/891

x^{2} - \frac{15}{81} = \frac{539}{891}

5 n^{2} + 1 = 0