In order to do this u have to be able to know how to solve by grouping so: (I'm gonna do this the way our teacher showed us so idk if u learned it in a different way)
6xy-9x-4y+6
The first step is to draw a line in the middle to make it easier
6xy-9x │-4y + 6
And then find the like terms to each side
3x(2y-3)│-2(2y-3)
And then we put the inside the brackets as one and the outsides as one bracket (ik that made absolute no sense lol) like this:
(2y-3) (3x-2)
And that's the final answer
Hope this helps!
