Find the greatest common factors (GCF / HCF) of the following polynomials :
6x2y2,9xy3,3x3y2
HCF of 6, 9, 3 = 3
HCF of x2,x,x3=x
HCF of y2,y3,y2=y2
∴ HCF =3xy2
36a2b2c4,54a5c2,90a4b2c2
x3,−yx2