Anyone want to help me with my Calculus homework? it would be greatly appreciated :)

Discussion in 'Community Discussion' started by christall109, May 4, 2008.

  1. christall109 macrumors 6502

    Joined:
    Jun 15, 2007
    #1
    Hey Guys so here's the problem:

    Solve for n.

    x^4 = x^(2n) times (-2x)^(n-11)

    Any advice would be greatly appreciated. I know there has to be math geniuses out there!
     
  2. christall109 thread starter macrumors 6502

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    Jun 15, 2007
    #3
    how? I was thinking doing it that way.
     
  3. dukebound85 macrumors P6

    dukebound85

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    #4
    well try it then instead of think it

    i could show you but that would pretty much mean i did the problem right? not purpose of assignment lol:cool:
     
  4. christall109 thread starter macrumors 6502

    Joined:
    Jun 15, 2007
    #5
    well I tried with the logs but got a invalid domain..

    so what i did was just set 4=2n + n - 11 and got n=5

    Is that correct?
    Thanks for the help!
     
  5. KompleX macrumors regular

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    Mar 4, 2008
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    Downey, CA
    #6
    did you mean this????
    x^(4) = x^[(2n)*(-2x)^(n-11)]
     
  6. iJohnHenry macrumors P6

    iJohnHenry

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    #7
    Anyone want to help me with my Calculus homework? it would be greatly appreciated :)

    Only if you wish to fail.

    This puts me in mind of a scene from the movie The Day The Earth Stood Still.

     
  7. dukebound85 macrumors P6

    dukebound85

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    #8
    you arent doing something right and without seeing steps its hard to comment
     
  8. siurpeeman macrumors 603

    siurpeeman

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    the OC
    #9
    i kind of read it as x^4 = [x^(2n)]*[(-2x)^(n-11)].

    the lazy person in me wants to move all the x's on one side and everything else to the other. and i do know that n = 6.5 is a solution for x = -2. i don't have any paper, so i can't think to make n as a function of x.

    because of the -2, you can't do this.
     
  9. Veldek macrumors 68000

    Veldek

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    Mar 29, 2003
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    Germany
    #10
    Transform the equation into

    x^4 = (x^2)^n * (-2x)^n * (-2x)^(-11)

    Then collect the ^n terms on one side, so that you only have one ^n term, and the rest on the other side. Then you can log it up.
     
  10. ArmyKnight12 macrumors 6502

    ArmyKnight12

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  11. NightFlight macrumors 6502

    NightFlight

    Joined:
    Feb 25, 2007
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    Northern Virginia
    #12
    Just thinking about this makes my brain hurt.

    I hated calc. :(
     
  12. christall109 thread starter macrumors 6502

    Joined:
    Jun 15, 2007
    #13
    Thanks guys I got a 100 on the assignment. I must of done something right.
     

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