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Posted by on Wednesday, December 26, 2012 at 9:52am.

Solve the following exponential equations.
8(6^2x+5)=7^3x-4

  • Math!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! - , Wednesday, December 26, 2012 at 10:36am

    taking it as written, I can't see an easy symbolic solution

    8*6^2x + 40 = 7^3x - 4

    assuming sloppy parentheses, and you meant

    8*6^(2x+5) = 7^(3x+4)

    then take logs of both sides:

    log8 + (2x+5)log6 = (3x-4)log7
    log8 + 2x log6 + 5log6 = 3x log7 - 4log7
    (2log6 - 3log7)x = -(4log7 + 5log6 + log8)

    x = log149361408/log12348 = 1.9978

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