1.3.1c Composite Function Example 3

Example 3

If

f : x \mapsto 2 x + 1

$f : x \mapsto 2 x + 1$ and

g : x \mapsto \frac{5}{x}, x \neq 0

$g : x \mapsto \frac{5}{x}, x \neq 0$ . Find the composite functions gf , fg and the value of gf(4).