11. The functions fg and h on the set of real
numbers are defined by f(x) = x² + 1,
g(x)=2x-3 and h(x) = 4x + 5 respec-
tively. Determine the formulae for the
composite function
(a) g[h(x)]
(b) h[f(x)]
(c) h[g(x)]