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Mathematics 4 Online
OpenStudy (anonymous):

in a problem like this where is the 4r and 3s coming from ? 5 24rs2 + 17 36r2s = 5 24rs2 · 3r 3r + 17 36r2s · 2s 2s = 15r 72r2s2 + 34s 72r2s2 = 15r + 34s 72r2s2

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