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Math Help - inequality

  1. #1
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    inequality

    The joint solution of inequality \log_\pi (x+1)+\log_\pi x<\log_\pi (2x+6) is?


    Answer:
    \{x \in IR;0<x<3\}
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  2. #2
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    Quote Originally Posted by boy47 View Post
    The joint solution of inequality \log_\pi (x+1)+\log_\pi x<\log_\pi (2x+6) is?


    Answer:
    \{x \in IR;0<x<3\}
    Using the usual log rule and a bit of re-arranging you should get x^2 - x - 6 < 0 which has the solution -2 < x < 3.

    But \log_{\pi} x is only defined for x > 0.

    Therefore ....
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