zs

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

受欢迎的代数 >

9x^2+36x+40=0

解答

9 x^{2} + 36 x + 40 = 0

解答

x = - 2 + i \frac{2}{3}, x = - 2 - i \frac{2}{3}

求解步骤

9 x^{2} + 36 x + 40 = 0

使用求根公式求解

x_{1, 2} = \frac{- 36 \pm 3 6 ^{2} - 4 \cdot 9 \cdot 40}{2 \cdot 9}

化简

3 6^{2} - 4 \cdot 9 \cdot 40 : 12 i

x_{1, 2} = \frac{- 36 \pm 12 i}{2 \cdot 9}

将解分隔开

x_{1} = \frac{- 36 + 12 i}{2 \cdot 9}, x_{2} = \frac{- 36 - 12 i}{2 \cdot 9}

x = \frac{- 36 + 12 i}{2 \cdot 9} : - 2 + i \frac{2}{3}

x = \frac{- 36 - 12 i}{2 \cdot 9} : - 2 - i \frac{2}{3}

二次方程组的解是:

x = - 2 + i \frac{2}{3}, x = - 2 - i \frac{2}{3}

作图

流行的例子

1/2 x^2-10= 3/2 x^2

\frac{1}{2} x^{2} - 10 = \frac{3}{2} x^{2}

114.7+12.8t-(9.8t^2)/2 =0

114.7 + 12.8 t - \frac{9.8 t ^{2}}{2} = 0

y^{2} = 15 y - 36

solvefor y,2x^2+2y^2-2x-2y+9=0

so l v e f or y, 2 x^{2} + 2 y^{2} - 2 x - 2 y + 9 = 0

5 (x^{2} - 8) - 9 = 6