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Thread: Really simple question

  1. Jul 27th, 2005, 04:35 AM #1
    zingmatter
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    Red face Really simple question

    Hi

    Sorry about this rather easy question but I'm not very good at maths and this is bugging me:

    X^y = Z

    If I know X and Z, how do I turn the equation around to determine the value of y?

    Thanks in advance.

    zing
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  2. Jul 27th, 2005, 07:21 AM #2
    BobTheBuilder.
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    Re: Really simple question

    If you were to take the logx (base x) of both sides this would yield:

    y = logx(Z)
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  3. Jul 27th, 2005, 07:46 AM #3
    penagate
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    Re: Really simple question

    xy = z

    y logax = logaz

    y = loga(z - x)

    Unless I've missed something.
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  4. Jul 27th, 2005, 07:54 AM #4
    BobTheBuilder.
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    Re: Really simple question

    Why not just take the log base x? That simplifies things a bunch...
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