Difference of squares | Factoring quadratics (article) | Khan Academy
https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:quadratics-multiplying-factoring/x2f8bb11595b61c86:factor-difference-squares/a/factoring-quadratics-difference-of-squares
WEBSince the two squares are being subtracted, we can see that this polynomial represents a difference of squares. We can use the difference of squares pattern to factor this expression: a 2 − b 2 = ( a + b) ( a − b) In our case, a = x and b = 4 . Therefore, our polynomial factors as follows: ( x) 2 − ( 4) 2 = ( x + 4) ( x − 4)
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