Question

Fatorar: (x + y)2 – (x – y)2

Answer 1

2x+2y -2x-2y
Resul final 0

Answer 2

  (x + y)² – (x – y)²
= x² + 2xy + y² - (x² - 2xy + y²) 
= x² + 2xy + y² - x² + 2xy - y²
= x² - x² + 2xy + 2xy + y² - y²
= 4xy