Question

Square the binomial (x + y).

Answer 1

`x^2 + 2xy + y^2`

Explanation:

`(x+y)^2 = (x+y)(x+y)`

F.O.I.L. the equation (first, outer, inner, last)

`(x+y)(x+y) = (x*x) + (x*y) + (x*y) + (y*y)`

`(x*x) + (x*y) + (x*y) + (y*y) = x^2 + xy +xy+y^2 = x^2 +2xy+y^2`