$\frac{m^2-25}{m-5}$
$\frac{4x^2-121}{2x+11}$
$\frac{x^2-y^2}{x+y}$
$\frac{x^2-16}{x-4}$
$\frac{m^2-n^2}{m-n}$
$\frac{x^2-25}{x+5}$
$\frac{4x^2-9y^2}{2x+3y}$
The difference of two squares is a squared number subtracted from another squared number. Every difference of squares may be factored according to the identity a^2-b^2=(a+b)(a-b) in elementary algebra.
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