Question

Simplifique as frações abaixo:
A)(5-2z)^2-(25+10z)

B)(2-2x)^2+(3-2x)^2-2 (x-3)

C)(3x+1)^2+(3x-1)-2

D)(x+y)^2-2xy

Answer 1

A)(5-2z)^2-(25+10z)
25 -20z + 2z^2- 25 – 10z

= 2zˆ2-30z


B)(2-2x)^2+(3-2x)^2-2 (x-3)

4-8x+4xˆ2 + 9 -12x + 4xˆ2 – 2x + 6

8x^2 – 20 x +11  

C)(3x+1)^2+(3x-1)-2
9xˆ2 + 6x + 1  +  3x – 1 – 2

9x^2 + 9x -2


D)(x+y)^2-2xy

x^2 + 2xy + y^2 – 2xy

x^2 + y^2