1. if lnx+ln(x-6) = ln3x then x= ????

2. if ln(4x+2)=5 then x= ???

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- Apr 21st 2008, 02:17 PMphil SNatural Log ?'s
1. if lnx+ln(x-6) = ln3x then x= ????

2. if ln(4x+2)=5 then x= ??? - Apr 21st 2008, 02:20 PMMoo
Hi

for the first one use the following properties :

ln(a)+ln(b)=ln(ab)

if ln(a)=ln(b) then a=b

So here x(x-6)=3x

For the second one, if ln(a)=b, then a=e^b (if it's natural logarithm)

-> 4x+2=e^5 - Apr 21st 2008, 02:22 PMJhevon