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Math Help - Solve for X

  1. #1
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    Solve for X

    9 = 40(2)^2x+1
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  2. #2
    MHF Contributor harish21's Avatar
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    Quote Originally Posted by advancedfunctions2010 View Post
    9 = 40(2)^2x+1
    Your notation is very confusing. Please write it clearly
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  3. #3
    Senior Member AllanCuz's Avatar
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    Quote Originally Posted by harish21 View Post
    Your notation is very confusing. Please write it clearly
    I think he wants,

     9 = 40(2)^{2x+1 }

    In which case we use basic logs.

     ln ( \frac{ 9}{40} ) = ln (2^{2x+1}) = (2x+1) ln2

     \frac { ln ( \frac{ 9}{40} )  }{ ln2} = 2x + 1

     \frac { ln ( \frac{ 9}{40} )  }{2 ln2} - \frac{1}{2} = x
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