0580 P22 - Mar 2018 - Q21 - 6 marks
13940
\(f(x)=7-x,\quad g(x)=4x+2,\quad h(x)=15-x^2\).
(a) Find ff(2). [2]
(b) Simplify gf(x). [2]
(c) Simplify h(2x). [2]
