Question 1165796
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For any two real numbers x and y, the product of their sum (x+y) and their difference (x-y) 
is the difference of their squares.


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See the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <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.