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 March 4th, 2016, 02:39 PM #1 Newbie   Joined: Feb 2016 From: Oregon Posts: 19 Thanks: 0 Logarithms I need help solving this problem: Find the solution(s) of the logarithmic equation log2(x2−5x−20)=2 Thanks!
 March 4th, 2016, 02:50 PM #2 Global Moderator   Joined: Dec 2006 Posts: 20,747 Thanks: 2133 Did you mean $\log_2$(x² - 5x - 20) = 2? That would imply x² - 5x - 20 = 4.
 March 4th, 2016, 02:58 PM #3 Math Team   Joined: Jan 2015 From: Alabama Posts: 3,264 Thanks: 902 Yes, this is a very difficult problem if you don't know what "log" means! In general, $\displaystyle log_a(x)= y$ is equivalent to $\displaystyle x= a^y$. In particular, $\displaystyle log_2(x)= 2$ is equivalent to $\displaystyle x= 2^2= 4$

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