Question

fatore completamente a expressao x^2-2xy+y^2-9

Answer 1

Olá :)

x²-2.x.y+y²-9

(x-y)² - 3²

Answer 2

$x² - 2xy + y² - 9$
$(x - y)² - 9$
$(x - y)² = 9$
$(x - y)² = 3²$
$x - y = 3$