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    Given that y=2^x, find expressions in terms of y for

     2^{x+2}

    and

    2^{3-x}

    Okay not sure how to give the answer on this question, for the first one I think its  4y not sure on the second one though.

    Thanks.
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    You split them up, 1st one becomes (2^x)(2^2) > so yes 4y

    2nd one > 8/y
 
 
 
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Updated: November 16, 2008

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