0580 P22 - Nov 2021 - Q20 - 5 marks
12935
\(f(x)=2^{x-3},\quad g(x)=2x-1,\quad h(x)=\frac5{x-4}\).
(a) Find \(ff(6)\). [2]
(b) Find \(g^{-1}g(x+21)\). [1]
(c) Find x when \(f(x)=h(84)\). [2]
