Answer:
xy - 4x + y^2 - 4y
Explanation:
Try to take each step slowly so that you don’t get lost or miss anything and remember to read from left to right:
(x + y)(y - 4)
Begin with multiplying x to y and -4:
xy - 4x + y(y - 4)
Then multiply y with y and - 4:
xy - 4x + y^2 - 4y