Assume that the function f\displaystyle {f} is invertible.

(a) If f(8)=6\displaystyle {f{{\left({8}\right)}}}={6}, find f1(6)\displaystyle {{f}^{{-{1}}}{\left({6}\right)}}.
Your answer is  

(b) If f1(2)=9\displaystyle {{f}^{{-{1}}}{\left(-{2}\right)}}=-{9}, find f(9)\displaystyle {f{{\left(-{9}\right)}}}.
Your answer is