Functions f and g are defined for $x \in \mathbb{R}$ by
$f:x{\text{ }} \mapsto 2x + 1$,
$g:x{\text{ }} \mapsto {x^2} - 2$.
a) Find and simplify expressions for $fg\left( x \right)$ and $gf\left( x \right)$.
b) Hence find the value of $\alpha $ for which $fg\left( \alpha \right) = gf\left( \alpha \right)$.
c) Find the value of $b\left( {b \ne \alpha } \right)$ for which $g\left( b \right) = b$.
d) Find and simplify an expression for ${f^{ - 1}}g\left( x \right)$.
The function h is defined by
$h:x{\text{ }} \mapsto {x^2} - 2$, for $x \leqslant 0$
e) Find an expression for ${h^{ - 1}}\left( x \right)$.
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