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(x-2)(x+2) =  x^{2} -4
~ Sum and Difference of Two Binomials (Factors) Difference of Two Squares (Product)
To get it,square the first term, and multiply the second terms.
(x+2) ^{2} =  x^{2} +4x+4
~Perfect Square Trinomial(Product)
To get it, square the first term,multiply the first term and second term and multiply it again by 2 and lastly, square the last term.

I hope that helps :)

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