The product is
(the product of the first term of each)plus
(the product of the last term of each) plus
(the product of the first term of the first and the last term of the second) plus
(the product of the first term of the second and the last term of the first).
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distributive
(a-b) (a+b) = a2+b2
multiply the 1st term with whole bracket and the 2nd term with whole bracket
no, because some examples are: (a-2)(a+2) = a^2-4 (binomial) & (a+b)(c-d) = ac-ad+bc-db (polynomial) but can 2 binomials equal to a monomial?
The ones that are the sum or the difference of two terms.