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Thread: Anyone want to help me with my math?

  1. #1
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    Anyone want to help me with my math?

    I have no idea how to do any of these:
    1.) Prove that if a+b is odd, then a^3+b^3 is odd.
    2.) Prove that the product of 3 even integers is divisible by 8.
    3.) Prove that (AnB)' is a subset of A' u B'
    Thanks guys, I know this isn't really where to ask for help, but my math friend Jesus is gone, and I need help.

  2. #2
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    Re: Anyone want to help me with my math?

    For the first question, the sum is always odd if a is odd and b is even or vice versa.
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  3. #3
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    Re: Anyone want to help me with my math?

    1) if a+b is odd => a OR b must be odd.
    If a is even a³ is even too,
    and if b is odd then b³ is odd too.
    => a³+b³ is odd. hope it is clear.
    (a proper demonstration would be to replace a by 2n and b by 2m+1, do the math, and it should fit! )
    2) An even integer can be written as the product of 2 and x, x being anything(even or odd).
    if you take 3 even integers, A, B and C:
    A=2a, B=2b and C=2c
    then A*B*C=2a*2b*2c=8*a*b*c
    I did my math in french, so sorry if the math terms aren't right.

    cheers,

    ghantoos

  4. #4
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    Re: Anyone want to help me with my math?

    ok man you have to make
    a+b=2n+1
    and you have to prove that
    a^3+b^3 is 2k+1
    ok i am pretty good at maths
    i dont remember very well but there must be some things if
    odd x odd = odd? or sth like that
    count on it
    make (a+b)^3 and see where it goes

    EDIT: THIS IS WRONG!!! DO NOT TRY
    I AM TOO OLD TO DO THAT.
    I WAS TAUGHT THAT 8 YEARS AGO AND I DONTREMEMBER THEM I AM AT THE UNIVERSITY NOW
    Last edited by arkara; September 24th, 2007 at 12:00 AM.
    If i could change something in the world..
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  5. #5
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    Re: Anyone want to help me with my math?

    at least show boolean algebra at least. sheesh! (only joking)

    if a.b=odd then
    a+b=odd;
    else a.b= even;

    thinking about it. That was **** and totally wrong. I was mixing my last programming attempt (VHDL) with what makes sense. Maybe i should have define my i/o (bit_vector, integers, naturals, etc) i'm tipsy)

    My dissertaion supervisor asked if my motorbike (suzuki DR125) was front or rear wheel drive. Need i say more!
    Last edited by regomodo; September 24th, 2007 at 12:06 AM.
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  6. #6
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    Re: Anyone want to help me with my math?

    ubuntuforums are not the proper place to get your homework done. Closing the thread, sorry.
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