Question

Разложить на множители:

1) 25a^2-(a+3)^2=...

2) x^2-x-y^2-y=...

Answer 1

$1) (5a-(a+3))(5a+(a+3))=(4a-3)(6a+3) \ 2) x^{2}-y^{2}-(x+y)=(x-y)(x+y)-1(x+y)=(x+y)(x-y-1)$