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log224-log23=log5x  Solve for x.  Please show your work.

 Jan 21, 2016
edited by gibsonj338  Jan 21, 2016
edited by gibsonj338  Jan 21, 2016
edited by gibsonj338  Jan 21, 2016

Best Answer 

 #2
avatar+129847 
+10

log224-log23=log5x     using a log rule, we can write

 

log2 [ 24/3]  = log5x

 

log2 [8]  = log5x

 

3  = log5x

 

This says that, in exponential form,

 

5^3  = x   =  125

 

 

cool cool cool

 Jan 21, 2016
 #1
avatar
+5

Solve for x:
(log(24))/(log(2))-(log(3))/(log(2)) = (log(x))/(log(5))

(log(24))/(log(2))-(log(3))/(log(2)) = (log(x))/(log(5)) is equivalent to (log(x))/(log(5)) = (log(24))/(log(2))-(log(3))/(log(2)):
(log(x))/(log(5)) = (log(24))/(log(2))-(log(3))/(log(2))

Multiply both sides by log(5):
log(x) = (log(5) log(24))/(log(2))-(log(3) log(5))/(log(2))

Cancel logarithms by taking exp of both sides:
Answer: | x = e^((log(5) log(24))/(log(2))-(log(3) log(5))/(log(2)))

                x=125

 Jan 21, 2016
 #2
avatar+129847 
+10
Best Answer

log224-log23=log5x     using a log rule, we can write

 

log2 [ 24/3]  = log5x

 

log2 [8]  = log5x

 

3  = log5x

 

This says that, in exponential form,

 

5^3  = x   =  125

 

 

cool cool cool

CPhill Jan 21, 2016

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