Question 1091992
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The <B>difference of squares formula</B> is &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{{{a^2 - b^2 = (a + b)*(a- b)}}}.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;For details and examples of applications of this formula see the lesson <A HREF=http://www.algebra.com/algebra/homework/Polynomials-and-rational-expressions/The_difference_of_squares_formula.lesson>The difference of squares formula</A> in this site.




When I was a student, we learned it at the 6-th grade, I think, and I remember it all my life (as it should be).



I had good teachers. Thanks to them.