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Posted by on Monday, January 7, 2013 at 11:00pm.

solve the equation

loga(x-5)- loga (x+9)=loga(x-7)-loga(x+9)

all a's are lower

please show work

  • math/calculus - , Tuesday, January 8, 2013 at 12:24am

    collect logs
    log((x-5)/(x+9)) = log((x-7)/(x+9))
    (x-5)/(x+9) = (x-7)/(x-9)
    assuming x ≠ -9,
    x-5 = x-7
    5 = 7

    no solution - typo?
    even easier, add log(x+9) to both sides to get

    log(x-5) = log(x-7)
    x-5 = x-7
    no solution

  • math/calculus - , Saturday, October 3, 2015 at 3:10am

    JJ, thanks so much! If you have any griakdnds here in the DFW area, you must, must, must take them to this museum! It's not to be missed! Is your grandson an artist or an architect? Thanks for sending to him!!!

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