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OpenStudy (anonymous):
25r^2+f^2-10rf
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OpenStudy (hoblos):
USE THE FORMULA a^2 + b^2 - 2ab = (a-b)2
OpenStudy (hoblos):
25r^2+f^2-10rf = (5r)^2 + f^2 - 2(5r)(f) = (5r-f)^2
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