1. a log 16/ a log 2 = 2. ( 5 log 9 ) ( 9 log 625 ) =

1) a log 16 / a log 2= { ( log 16 / log a ) / (log 2 / log a } = ( log 16 / log a ) x (log a / log 2 )
= log 16 / log 2
= log 2^4 / log 2
= 4.log 2 / log 2
= 4
1) (5log 9) (9log 125)=
= (log 9 / log 5 ) ( log 125 / log 9 )
= log 125 / log 5
= log 5^3 / log 5
= 3.log 5 / log 5
= 3