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Math Help - Express as a Function.

  1. #1
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    Express as a Function.

    A rectangle has area 64 m2.

    (a) Express the perimeter of the rectangle as a function of the length (L) of one of its sides.

    I came up with A(L) = 2x + (128/x) or 2L + (128/L)

    (b) State its domain.

    How do I state its domain?

    Is it [0, INFINITY) ?
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  2. #2
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    Re: Express as a Function.

    Quote Originally Posted by NeoSonata View Post
    or 2L + (128/L)

    Yep!

    Quote Originally Posted by NeoSonata View Post


    Is it [0, INFINITY) ?
    You're on the right track here, it can't be zero or we wouldn't have a rectangle.
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