Question 838121
{{{ f(x)= x-1 / (2x-4) }}} and {{{ g(x)= sqrt ( 5-x ) }}}
A) I assume you mean f(4)*g(4).
{{{f(4)=4-1/(2(4)-4)=4-1/(8-4)=4-1/4=15/4}}}
{{{g(4)=sqrt(5-4)=sqrt(1)=1}}}
{{{f(4)*g(4)=15/4}}}
B) {{{g(1)=sqrt(5-1)=sqrt(4)=2}}}
{{{f(g(1))=f(2)=2-1/(2(2)-4)=2-1/0}}} 
f(g(1)) is undefined.