How do you determine if a polynomial is the difference of two squares?

If the two factors are the original first variable plus the second variable in the first bracket, and the first variable minus the second variable in the second bracket. For example: (X-a)(x+a)=X squared minus A squared. The central number cancels itself out in this ONE case.

I believe you look for a pattern like:

ax^2 - b

where 'a' and 'b' both have integer square roots.

e.g. 25x^2 - 4 = (5x + 2)(5x - 2)

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