Question 4940
Let's put empty parentheses in these equations instead of x:
f( )=-3( )-3

g( )=( )^2+2( )
Then fill in the blanks with 2:
{{{f(2)=-3(2)-3}}}  {{{g(2)=(2)^2+2(2)}}}
so f(2)=3 and g(2)=8
then (f-g)(2)=3-8=-5