Question

Разложите на множители:
a) -xy+7x+5y-35
б) 5a²+10ay+5y²

Answer 1

-x(y-7) 5(y-7)=(5-x)(y-5)
(5a+y)2

Answer 2

a) -xy+7x+5y-35=(7x-xy)+(-35+5y)=x (7-y)-5 (7-y)=(x-5)(7-y).
б) 5a^2+10ay+5y^2=5 (a^2+2ay+y^2)=5 (a+y)^2.