3. The curve \(C\) has equation
$$y = 2 \sqrt { } x + \frac { 18 } { \sqrt { } x } - 1 , \quad x > 0$$
- Find
- \(\frac { \mathrm { d } y } { \mathrm {~d} x }\)
- \(\frac { \mathrm { d } ^ { 2 } y } { \mathrm {~d} x ^ { 2 } }\)
- Use calculus to find the coordinates of the stationary point of \(C\).
- Determine whether the stationary point is a maximum or minimum, giving a reason for your answer.
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