A binomial is a set of two terms. An example might be:
x+1
Here we count the x and the 1 as terms and with "bi-" meaning "two" we can say the expression above is a binomial.
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A binomial is a mathematical term for a polynomial with two terms.
You multiply each term of one binomial by each term of the other binomial. In fact, this works for multiplying any polynomials: multiply each term of one polynomial by each term of the other one. Then add all the terms together.
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.
Binomial is an expression of two terms. The difference means subtracting. So your question is subtracting two term expressions.
> square the 1st term >twice the product of the first and last term >square the last term