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受欢迎的代数 >

-4x^2+8x=9

解答

- 4 x^{2} + 8 x = 9

解答

x = 1 - i \frac{5}{2}, x = 1 + i \frac{5}{2}

求解步骤

- 4 x^{2} + 8 x = 9

将

9

para o lado esquerdo

- 4 x^{2} + 8 x - 9 = 0

使用求根公式求解

x_{1, 2} = \frac{- 8 \pm 8 ^{2} - 4 ( - 4 ) ( - 9 )}{2 ( - 4 )}

化简

8^{2} - 4 (- 4) (- 9) : 45 i

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

将解分隔开

x_{1} = \frac{- 8 + 4 5 i}{2 ( - 4 )}, x_{2} = \frac{- 8 - 4 5 i}{2 ( - 4 )}

x = \frac{- 8 + 4 5 i}{2 ( - 4 )} : 1 - i \frac{5}{2}

x = \frac{- 8 - 4 5 i}{2 ( - 4 )} : 1 + i \frac{5}{2}

二次方程组的解是:

x = 1 - i \frac{5}{2}, x = 1 + i \frac{5}{2}

作图

流行的例子

7 x^{2} + 63 x = 0

-2/3 (6/5 x-7/10)= 17/20

- \frac{2}{3} (\frac{6}{5} x - \frac{7}{10}) = \frac{17}{20}

化简 (6x^5y^3)^2

s im pl i f y (6 x^{5} y^{3})^{2}

因式分解 5x+20

f a c t or 5 x + 20

x^{2} - 5 x - 84 = 0