An algebraic expression with two only terms is said to be as binomial. There are a lot of algebraic identity for binomials . This is a table that gives the output value for the square of the sum[ (x+y)^2] for different values of x and y. This table would help you a lot to solve the square of the binomial sum [(x+y)^2 expression].
(x + y)2 = x2 + 2xy + y2