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Thread: Solve for X

  1. May 17th 2010, 07:10 PM #1
    advancedfunctions2010
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    Solve for X

    9 = 40(2)^2x+1
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  2. May 17th 2010, 07:36 PM #2
    harish21
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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. May 17th 2010, 08:04 PM #3
    AllanCuz
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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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