**Difference of squares | Factoring quadratics (article) | Khan …**
https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:quadratics-multiplying-factoring/x2f8bb11595b61c86:factor-difference-squares/a/factoring-quadratics-difference-of-squares

WebHow would you factor a "difference of squares" problem WITHOUT using this formula? ... (3 terms). With the difference of two squares, we get only a binomial (2 terms). Why does the middle term not exist? It's because it has a coefficient of 0. So, if you forget the pattern, stub in the middle term: x^2 + 0x - 4

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