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Posted by Ashley A. on Saturday, December 17, 2011 at 8:36pm.

LCM of (2+9u),(4-81u^2)and (2-9u)

LOL a^2 - b^2 = (a-b)(a+b) identity, know it so 4 - 81 u^2 = (2-9u)(2+9u) so 4 - 81 u^2 is the multiple you are looking for

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