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6 April, 17:06

Ln x + ln (x + 1) = ln 56

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  1. 6 April, 19:37
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    x=7

    Step-by-step explanation:

    ln x + ln (x+1) = ln 56

    ln x (x+1) = ln 56

    so x (x+1) = 56

    x^2+x-56=0

    (x+8) (x-7) = 0

    x = - 8 or x=7

    and lnx, x>0

    so x=7
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