Calculus Calculus Math Forum

 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 $\displaystyle x= 2^2= 4$ Tags logarithms Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post zendetax Algebra 1 September 23rd, 2015 06:37 AM Mindless_1 Algebra 2 November 14th, 2012 12:02 PM hahachow Algebra 1 October 3rd, 2012 09:04 AM BrianMX34 Algebra 7 September 6th, 2012 01:32 PM OriaG Calculus 2 December 31st, 1969 04:00 PM

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