2 The polynomial \(x ^ { 3 } - 2 x + a\), where \(a\) is a constant, is denoted by \(\mathrm { p } ( x )\). It is given that ( \(x + 2\) ) is a factor of \(\mathrm { p } ( x )\).
- Find the value of \(a\).
- When \(a\) has this value, find the quadratic factor of \(\mathrm { p } ( x )\).