For integers x and y, if (x+2)(y+3) is even then 4xy must be divisible by:

For integers x and y, if (x+2)(y+3) is even then 4xy must be divisible by:

Quiz

Answer/Solution

4

Steps/Work

Just looking at the question, (x+2)(y+3) could be even*even, odd*even, or even*odd in order for the whole expression to be even.
However, just looking at 4xy, since x*y will always be an integer, it will always be divisible by 4. 4 divided by 4 is 1, hence preserving x*y.
Answer: A. 4