Answer:
x^2+2xy+y^2
Step-by-step explanation:
(x + y)(x + y)
FOIL
first x*x = x^2
Outer x*y = xy
inner: y*x = xy
last y*y = y^2
add together
x^2+xy+xy+y^2
Combine like terms
x^2+2xy+y^2
The answer would be y=3/2
He would need 4 boxes but he will have 9 sq feet of tile left.(he needs 3.25 boxes for an exact answer.)