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受欢迎的代数 >

-7x^2+4x-2=0

解答

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

解答

x = \frac{2}{7} - i \frac{10}{7}, x = \frac{2}{7} + i \frac{10}{7}

求解步骤

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

使用求根公式求解

x_{1, 2} = \frac{- 4 \pm 4 ^{2} - 4 ( - 7 ) ( - 2 )}{2 ( - 7 )}

化简

4^{2} - 4 (- 7) (- 2) : 210 i

x_{1, 2} = \frac{- 4 \pm 2 10 i}{2 ( - 7 )}

将解分隔开

x_{1} = \frac{- 4 + 2 10 i}{2 ( - 7 )}, x_{2} = \frac{- 4 - 2 10 i}{2 ( - 7 )}

x = \frac{- 4 + 2 10 i}{2 ( - 7 )} : \frac{2}{7} - i \frac{10}{7}

x = \frac{- 4 - 2 10 i}{2 ( - 7 )} : \frac{2}{7} + i \frac{10}{7}

二次方程组的解是:

x = \frac{2}{7} - i \frac{10}{7}, x = \frac{2}{7} + i \frac{10}{7}

作图

流行的例子

5(g-3)>7(2g+5)-(-4g)

5 (g - 3) > 7 (2 g + 5) - (- 4 g)

因式分解 3x^2+18x+30

f a c t or 3 x^{2} + 18 x + 30

5 + (- 3) - 6 - (- 1)

因式分解-32m^4n^2+14mn^3

f a c t or - 32 m^{4} n^{2} + 14 m n^{3}

6s-4=8(2+1/4 s)

6 s - 4 = 8 (2 + \frac{1}{4} s)