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受欢迎的代数 >

-8x^2-x-2=0

解答

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

解答

x = - \frac{1}{16} - i \frac{3 7}{16}, x = - \frac{1}{16} + i \frac{3 7}{16}

求解步骤

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

使用求根公式求解

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

化简

(- 1)^{2} - 4 (- 8) (- 2) : 37 i

x_{1, 2} = \frac{- ( - 1 ) \pm 3 7 i}{2 ( - 8 )}

将解分隔开

x_{1} = \frac{- ( - 1 ) + 3 7 i}{2 ( - 8 )}, x_{2} = \frac{- ( - 1 ) - 3 7 i}{2 ( - 8 )}

x = \frac{- ( - 1 ) + 3 7 i}{2 ( - 8 )} : - \frac{1}{16} - i \frac{3 7}{16}

x = \frac{- ( - 1 ) - 3 7 i}{2 ( - 8 )} : - \frac{1}{16} + i \frac{3 7}{16}

二次方程组的解是:

x = - \frac{1}{16} - i \frac{3 7}{16}, x = - \frac{1}{16} + i \frac{3 7}{16}

作图

流行的例子

因式分解 35k^2-22k+7=4

f a c t or 35 k^{2} - 22 k + 7 = 4

solvefor x,f=k-5k+1x^2-20

so l v e f or x, f = k - 5 k + 1 x^{2} - 20

6x^2+24x-30=810

6 x^{2} + 24 x - 30 = 810

x^{2} - 15 x = 11 - 5 x

c^{2} = 6^{2} + 5^{2}