Question 884064
What do u and v have to do with f and g?
Please repost. 
Are you looking for f(g)?
{{{f(g)=g^2-1}}}
{{{f(g)=(2x-3)^2-1}}}
{{{f(g)=4x^2-12x+9-1}}}
{{{f(g)=4x^2-12x+8}}}