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Math Help - Algebra help

  1. #1
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    Algebra help

    Hi, I'm having trouble with this question.

    Find the minimum for y
    y=(a+x)(b+x)\cx
    c,x,b,a>0

    Can anyone help? Thanks.
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  2. #2
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    Hi
    To solve this problem lets first expand through

    solve for dervitive
    set y prime =0
    solve for x

    put x into y equations
    and proove one of smaller thne the other
    Last edited by sammylemon; September 5th 2009 at 08:14 PM.
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  3. #3
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    Sorry, what is 'lim'? Limit?
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  4. #4
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    yes
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  5. #5
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    Thanks so far, although I still don't understand this part:

    now you said a,b,c,x >0 so if we take a lim x-> 0

    limx->0 ab/cx + b/c +a/c + x/c
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  6. #6
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    oh nvm im very wroung

    hehe sorry

    take the derivtive solve for x at y prime=0
    you should get 2 values
    find the lower value by pulling both into original y equations lower one is ur result

    in this cause ull have to prove on os smaller then the other
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  7. #7
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    Sorry, I don't really understand? :S
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