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受欢迎的代数 >

-3x^2+5x=8

解答

- 3 x^{2} + 5 x = 8

解答

x = \frac{5}{6} - i \frac{71}{6}, x = \frac{5}{6} + i \frac{71}{6}

求解步骤

- 3 x^{2} + 5 x = 8

将

8

para o lado esquerdo

- 3 x^{2} + 5 x - 8 = 0

使用求根公式求解

x_{1, 2} = \frac{- 5 \pm 5 ^{2} - 4 ( - 3 ) ( - 8 )}{2 ( - 3 )}

化简

5^{2} - 4 (- 3) (- 8) : 71 i

x_{1, 2} = \frac{- 5 \pm 71 i}{2 ( - 3 )}

将解分隔开

x_{1} = \frac{- 5 + 71 i}{2 ( - 3 )}, x_{2} = \frac{- 5 - 71 i}{2 ( - 3 )}

x = \frac{- 5 + 71 i}{2 ( - 3 )} : \frac{5}{6} - i \frac{71}{6}

x = \frac{- 5 - 71 i}{2 ( - 3 )} : \frac{5}{6} + i \frac{71}{6}

二次方程组的解是:

x = \frac{5}{6} - i \frac{71}{6}, x = \frac{5}{6} + i \frac{71}{6}

作图

流行的例子

- 2 x + 3 = - 8 x^{2}

20 + w = 10

因式分解 5x^2-52x+20

f a c t or 5 x^{2} - 52 x + 20

19 + 4 x < 39

化简 2sqrt(18)-2sqrt(20)-2sqrt(5)

s im pl i f y 218 - 220 - 25