a³+5ab-a²b-5a²
=a^3-ba^2+5ab-5a^2
=(a-b)a^2+5a(b-a)
=(a-b)(a^2-5a)
=a(a-5)(a-b)
6ax-9ay+2bx-3by
=3a(2x-3y)+b(2x-3y)
=(3a+b)(2x-3y)