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Use the properties of logarithms to write the expression as a single logarithm:

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2 Answers

logcan = n*logca

                                a

logca - logcb = logc --- 
                                b

logca + logcb = logc(ab) 
~~~~~~~~~~~~~~~~~~~ 

7 ln x  - (1/4) ln y =

ln x7  -  ln y1/4 =

       x7             x7  
ln ------ = ln ----
     y1/4           4√y