Question 51251
f(x)=1/x-2=y say
g(x)= 4/x =z say
(fog)(x)=f(g(x))=f(z)=1/(z-2)=1/{(4/x)-2}=2/(4-2x)=1/(2-x)
(gof)(x) =g(f(x))=g(y)= 4/y=4/{1/(x-2)}=4(x-2)
please can you show me how to do this problem?