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 >

(5+x)(5-x)=7

解答

(5 + x) (5 - x) = 7

解答

x = - 32, x = 32

+1

十进制

x = - 4.24264 \dots, x = 4.24264 \dots

求解步骤

(5 + x) (5 - x) = 7

展开

(5 + x) (5 - x) : 25 - x^{2}

25 - x^{2} = 7

将

7

para o lado esquerdo

- x^{2} + 18 = 0

使用求根公式求解

x_{1, 2} = \frac{- 0 \pm 0 ^{2} - 4 ( - 1 ) \cdot 18}{2 ( - 1 )}

0^{2} - 4 (- 1) \cdot 18 = 62

x_{1, 2} = \frac{- 0 \pm 6 2}{2 ( - 1 )}

将解分隔开

x_{1} = \frac{- 0 + 6 2}{2 ( - 1 )}, x_{2} = \frac{- 0 - 6 2}{2 ( - 1 )}

x = \frac{- 0 + 6 2}{2 ( - 1 )} : - 32

x = \frac{- 0 - 6 2}{2 ( - 1 )} : 32

二次方程组的解是:

x = - 32, x = 32

作图

流行的例子

completesquare-x^2-3x+3

co m pl e t es q u a re - x^{2} - 3 x + 3

x^{2} + 4^{2} = 25

4(x+5)^2-7(x+2)^2=6x

4 (x + 5)^{2} - 7 (x + 2)^{2} = 6 x

completesquare x^2+6x+73

co m pl e t es q u a re x^{2} + 6 x + 73

-150=90t-4.9t^2

- 150 = 90 t - 4.9 t^{2}