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+6x-2=7

解答

9 x^{2} + 6 x - 2 = 7

解答

x = \frac{- 1 + 10}{3}, x = - \frac{1 + 10}{3}

+1

十进制

x = 0.72075 \dots, x = - 1.38742 \dots

求解步骤

9 x^{2} + 6 x - 2 = 7

将

7

para o lado esquerdo

9 x^{2} + 6 x - 9 = 0

使用求根公式求解

x_{1, 2} = \frac{- 6 \pm 6 ^{2} - 4 \cdot 9 ( - 9 )}{2 \cdot 9}

6^{2} - 4 \cdot 9 (- 9) = 610

x_{1, 2} = \frac{- 6 \pm 6 10}{2 \cdot 9}

将解分隔开

x_{1} = \frac{- 6 + 6 10}{2 \cdot 9}, x_{2} = \frac{- 6 - 6 10}{2 \cdot 9}

x = \frac{- 6 + 6 10}{2 \cdot 9} : \frac{- 1 + 10}{3}

x = \frac{- 6 - 6 10}{2 \cdot 9} : - \frac{1 + 10}{3}

二次方程组的解是:

x = \frac{- 1 + 10}{3}, x = - \frac{1 + 10}{3}

作图

流行的例子

- 7 = 5 x^{2} - 4 x - 7

x^{2} - 15 = 10

x^2+x-12=x+4x+4

x^{2} + x - 12 = x + 4 x + 4

3 x^{2} - 486 = 0

solvefor x,3x^2-12=0

so l v e f or x, 3 x^{2} - 12 = 0