How do you multiply 2x by 2y?

suppose u have a(x) and b(y)where a and b are constants , Multiplying a(x) by b(y) it's simply ab(xy) So if u have 2x by 2y this equals to 4xy

or

The answer is 4xy.

2x = 2 times x

2y = 2 times y

2 times x times 2 times y = 2 times 2 times x times y = 4xy