121r^2-64t^2
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2 Answers

yu dont

yu hav 2 variabels...r & t

yu mite tri tu plot sum values...but yu need 3-D paper
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There is no greatest common factor, however Both 121 and 64 are perfect squares, so you can factor it down to (11r)^2 - (8t)^2, which can then factor down to (11r-8t)^2 which factors to (11r-8t)(11r+8t).  Correct me if I'm wrong, but i think this is right.
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