Factoring a Long Expression: 2x^2 - y^2 + xy + 13x -8y - 7

Three methods on how to factor 2x^2 - y^2 + xy + 13x -8y - 7.

[brycerivero]

Diba po sir pwede ring i multiply ng negative ung both trinomials to get the equivalent expression? example, (2x-y)(3x-y) is the same as (y-2x)(y-3x). In this case, pagdating sa competition math, which would be more acceptable? I imagine that both should be considered, but what do you think sir? which would be more safe to give as the answer?