Verified answer

(2x-y)(13x-7y)

To get this:

(26x-ay)(26x-by)/26

(minus because the multiply for a positive and add for a negative)

now a*b=7*26

and a+b=27

Only 2 possible numbers are 13 and 14

so

(26x-13y)(26x-14y)/26

=13(2x-y)*2(13x-7y)/26

=(2x-y)(13x-7y)

(2x-y)(13x-7y)

2x*13x=26x^2

2x*-7y=-14xy

-y*13x=-13xy

-y*-7y=+7y^2

(2x - y)(13x-7y)