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March 4th, 2016, 02:39 PM   #1
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Logarithms

I need help solving this problem:

Find the solution(s) of the logarithmic equation
log2(x2−5x−20)=2

Thanks!
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March 4th, 2016, 02:50 PM   #2
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Did you mean $\log_2$(x² - 5x - 20) = 2? That would imply x² - 5x - 20 = 4.
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March 4th, 2016, 02:58 PM   #3
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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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