Question

4. Simplifique as expressões abaixo:
A) (x+y)²-x²-y²?
B) (x+2).(x-7)+(x-5).(x+3)
C) (2x-y)²-4x(x-Y)​

Answer 1

A)

(x+y)²-x²-y²

= x²+2xy+y² - x²- y²

= 2xy

B)

(x+2).(x-7)+(x-5).(x+3)

x²-7x+2x -14 + x²+3x - 5x -15

= 2x²-7x-29