Rozlozyc na czynniki- a) 12p^3q^2 - 9pq^3 b) 3a^2 - 6ab^3 + 15ab c) 2ax - 3ay + 2by - 3by

[latex]a) 12p ^{3}q ^{2} -9pq ^{3}=3pq ^{2}(4 p^{2}-3q) \ b) 3a^{2}-6ab ^{3}+15ab=3a(a-2 b^{3}+5b) \ c) 2ax-3ay+2by-3by=2ax-3ay-by=a(2x-2y)-by \ [/latex]