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Homework Help: Is this correct please - Binomial Theorem

  1. Feb 14, 2006 #1
    I'm a complete beginner at these:

    (3n+1)^3 = (3n)^3 + 3(3n)^2 + 3(3n)^2 + 1

    which would give me

    = 3 (9n^3 + 6n^2) +1 is this correct?
     
    Last edited: Feb 14, 2006
  2. jcsd
  3. Feb 14, 2006 #2
    anyone :confused: ??
     
  4. Feb 14, 2006 #3

    0rthodontist

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    Science Advisor

    No, that is not correct.
    Your exponents should go from 3 down to 0.
    This is also not correct.
     
  5. Feb 15, 2006 #4

    HallsofIvy

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    Science Advisor

    Perhaps it is a typo but you should not have "^2" twice.

    You have added 3(3n)^2 and 3(2n)^2 but the second shouldn't be squared.
     
  6. Feb 15, 2006 #5
    thanks :-)
     
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