If you want to know how to square a trinomial, you should first know the basic.
(a+b+c)^2=?
you have to square the first three terms then multiply 2 to the last three terms. All you have to do is to remember that a square of trinomial has 6 terms in the answer
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[ Ax2 + Bx + C ] is one example.
No.
A trinomial of the form ax2 + bx + c is a perfect square if (and only if) b2-4ac = 0 and, in that case, it is factored into a*(x + b/2a)2