It is not possible for a perfect square to have just 2 terms.
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It can be factored as the SQUARE OF A BINOMIAL
(a^2 - b^2) = (a - b)(a + b)
Each has two binomial factors.
no
Yes. With w and z being any two numbers or variables: Take (w + z)2 = (w + z)(w + z) = ww + wz + zw + zz = w2 + 2wz + z2, which is the perfect square trinomial.