Answer:
[tex](y+4)(x-4)[/tex]
Step-by-step explanation:
Given the expression:
[tex]xy-4y+4x-16[/tex]
[tex](xy-4y)+(4x-16)[/tex]
Take the common factor
[tex]y(x-4)+4(x-4)[/tex]
(x-4)(y+4)
First you group the expression to get (xy+4x)+(-4y-16)
then factor to get x(y+4)-4(y+4)
and factor again to get (x-4)(y+4)
