Question

Descompunerea in factori a expresiei x la puterea2 -y la puterea 2 - 2y -1 este

Answer 1

$x^2-y^2-2y-1=x^2-(y^2+2y+1)=x^2-(y+1)^2=\\\\=\boxed{(x-y-1)(x+y+1)}$