No, it's not a binomial. (x + 5) is an example of a binomial. A binomial has more than one term. Just look at the word binomial and you will know why. Bi means two.2xy is a monomial. Mono means one.
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Neither of those expressions is a binomial. [ 2y + 2xy ] is a binomial.
Monomial.
(x + y)2 = x2 + 2xy + y2
√18xy = √(9*2xy) = √9*√2xy = 3*√(2xy)
4xy - 2xy