Question

2x^2+xy+6x+3y
A.
difference of two squares
B.
grouping
C.
greatest common factor
D.
perfect square tri

Answer 1

When you have 4 terms, you usually try to factor by grouping.
There is no greatest common factor here.
A difference of two squares has only 2 terms; here you have 4.
A perfect square _trinomial_ has to be a trinomial, 3 terms. Here you have 4.