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Kathryn Ashley
Mathematics
22 November, 09:42
Ln x + ln (x + 1) = ln 56
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Markus Hoffman
22 November, 09:48
0
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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