1. if lnx+ln(x-6) = ln3x then x= ???? 2. if ln(4x+2)=5 then x= ???
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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
Originally Posted by phil S 1. if lnx+ln(x-6) = ln3x then x= ???? $\displaystyle \ln x + \ln (x - 6) = \ln 3$ $\displaystyle \Rightarrow \ln x(x - 6) = \ln 3x$ now what? can you continue? 2. if ln(4x+2)=5 then x= ??? $\displaystyle \ln (4x + 2) = 5$ $\displaystyle \Rightarrow e^5 = 4x + 2$ i think you can take it from here
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