You can
put this solution on YOUR website!f(a)=2a-1 If this is true, then that part of the problem (f(a))is solved! The answer is 2a-1.
G(a)= a2 If this is true then the variable g and a or the same thing. I hope that that is "a" to the second notation!
the answer to this problem is g(2a-1)or
2ga-g or
2a2<---(second notation)-a