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Math Help - help????

  1. #1
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    help????

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

    1) 2^(x+2)
    2) 2^(3-x)
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  2. #2
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    Quote Originally Posted by kls7162 View Post
    given that y=2^x , find expressions in terms of y for

    1) 2^(x+2)
    2) 2^(3-x)
    Hello,

    2^{x+2}=2^x \cdot 2^2=4 \cdot 2^x = 4y

    2^{3-x}=2^3 \cdot \frac{1}{2^x}=\frac{8}{y}
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