Question 1198288
Only helping.


#8:
Simple substitution, and evaluate.


#9:
f(3) is used as input for g(x).

{{{f(3)=11*3^2+12*3-12}}}
{{{f(3)=99+36-12}}}
{{{f(3)=99+24}}}
{{{f(3)=123}}}

Next part, the use of a calculator might be comfortable to do.
{{{g(123)=12*123^2-11*123+11}}}
Compute this.