Răspuns:
a) 18ax-6ay+15bx-5by=
=6a(3x-y)+15b(3x-y)=
=(3x-y)(6a+15b)
b) x²+2y+9ax²+18ay=
=x²+9ax²+2y+18ay=
=x²(1+9a)+2y(1+9a)=
=(1+9a)(x²+2y)
c) 10ax+25ay-22bx-55by=
=5a(2x+5y)-11b(2x+5y)=
=(2x+5y)(5a-11b)
d) x³+x²+x+1=
=x²(x+1)+(x+1)=
=(x+1)(x²+1)
