- The functions f and g are defined by
$$\begin{aligned}
& f ( x ) = 7 - 2 x ^ { 2 } \quad x \in \mathbb { R }
& \operatorname { g } ( x ) = \frac { 3 x } { 5 x - 1 } \quad x \in \mathbb { R } \quad x \neq \frac { 1 } { 5 }
\end{aligned}$$
- State the range of f
- Find gf (1.8)
- Find \(\mathrm { g } ^ { - 1 } ( x )\)