Question

if f(x)= x-1 ÷x+1 then find f(1)=​

Answer 1

Answer:

f(x)=  

x−1

x+1

​  

 

fof(x)=  

f(x)−1

f(x)+1

​  

=  

x−1

x+1

​  

−1

x−1

x+1

​  

+1

​  

=  

x+1−x+1

x+1+x−1

​  

=x

i)(fofof)(x)=f(fof(x))=f(x)=  

x−1

x+1

​  

 

ii)(fofofof)(x)=fof(fof(x))=fof(x)=x