Question 310890
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It is the difference of two squares.


The pattern is:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ a^2\ -\ b^2\ =\ (a\ +\ b)(a\ -\ b)]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 25r^2\ =\ (5r)^2]


and


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 64\ =\ 8^2]



John
*[tex \LARGE e^{i\pi} + 1 = 0]
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