Question

Calcule (x + y)² - (x - y)² :​

Answer 1

Oie, Td Bom?!

$= (x + y) {}^{2} - (x - y) {}^{2}$

$= (x + y - (x - y)) \: . \: (x + y + x - y)$

$= (x + y - x + y) \: . \: 2x$

$= 2y \: . \: 2x$

$= 4xy$

Att. Makaveli1996