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Mathematics 17 Online
OpenStudy (anonymous):

If ln x + ln(x-4)=ln 4x, then x=??

OpenStudy (saifoo.khan):

x(x-4) = 4x

OpenStudy (anonymous):

hhmm?

OpenStudy (nenadmatematika):

yes, correct, but just be careful, because the solutions of saifoo.khan's equation is x=0 and x=8, but x=0 you must throw away because domain of lnx is x>0....so the solution is 8

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