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Neat Function problem

  1. Apr 27, 2009 #1
    1. The problem statement, all variables and given/known data

    An open box wit ha square base is required to have a volume of 38 cubic feet. Express the amount A of material that is needed to make such a box as a function of the length x of a side of the square base. We need to find the solution for the least amount of material used.

    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 28, 2009 #2

    symbolipoint

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    Initially, your question description seems incomplete. Do you have a preformed net which merely needs to be folded into the box form? You made no comment related to the height of this box with the square base of x by x. Better----> an expression for height can be made. h*x*x=38. h is the height. If A is area of the net, then an expression can be made for this area from the numbers of h and x.

    note: I tried to make a 'strike-through' of the first sentence but the tagging seems to not work.
     
    Last edited: Apr 28, 2009
  4. Apr 28, 2009 #3

    symbolipoint

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    After trying that exercise myself, the original question belongs better in the Calculus board. The solution process yields a rational expression; you want to minimize the Area function.

    On the other hand, if you would use a graphing program, you can determine a good value fairly easily without the use of Calculus.
     
    Last edited: Apr 28, 2009
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