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Example 6
If f (x) = 16x - log 2 x find f 
Solution :
If f (x) = 16x - log2x
\ f =
= 
= 
= 2 - ( -2) log2 2
= 2 + 2 (1) [ since. log a a = 1]
= 4
Example 7
If y = f (x) =  show
that x = f(y)
Solution :
y = f (x) = 
Þ f (y) = 
Putting y =  we get
\ f (y) = 
\ f (y) = 
= x \ x = f (y)
Example 8
If f (x) = 
find f { f [f(x)] }
Solution :
f (x) = 
f [ f(x) ] = 
\ f [ f(x) ] = 
and f { f [f(x)] } = 
\ f { f [f(x)] } = x
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