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July 28, 2015

Homework Help: Logarithms

Posted by Anonymous on Monday, August 25, 2008 at 6:25pm.

Solve log4 x + log4(x-2)=log4(15)


I know how do the example in my book but I don't know what I'm doing wrong here.

log4 x + log4(x-2)=log4(15)
log4 [x + log4(x-2)]=log4(15)
(x^2 + x)=4
x^2 + x-4=0

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