Question 799621
Just form both composition functions, and evaluate each of them at x=2.  A few simple algebra simplification steps.


{{{f(g(x))=2(x^2)=2x^2}}}
Let x=2.
{{{2*(2)^2=8}}}


{{{g(f(x))=(2x)^2=4x^2}}}
Let x=2.
{{{4*(2)^2=4*4=16}}}