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21 November, 05:59

Log (x) + log (x + 5) = log (6 x + 12)

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  1. 21 November, 07:35
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    x = 4

    Step-by-step explanation:

    log (x) + log (x + 5) = log (6 x + 12)

    log [x (x + 5) ] = log (6x + 12)

    x (x + 5) = 6x + 12

    xx + 5x = 6x + 12

    xx - x - 12 = 0

    (x - 4) (x + 3) = 0

    x = 4 or x = - 3

    but we cannot have negative numbers

    so x = 4
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