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math

posted by on .

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

  • math - ,

    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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