Question

x^2-xy+a^2x-a^2y

x^2-xy+a^2x-a^2y
7m^2-3n+mn-21m
0.3ax+0.6ay+x+2y
25x^4-x^2-2x-1
x^5y^2-x^3-3xy+3

Answer 1

x(x-y)+a^2(x-y)=(x+a^2)(x-y)
7m(m-3)+n(m-3)=(7m+n)(m-3)
(0.3a+1)x+2(0.3a+1)y=(0.3a+1)(x+2y)
x^3(xy+1)(xy-1)-3(xy-1)=(xy-1)[x^3(xy+1)-3]