2. (a) Find the first 3 terms, in ascending powers of \(x\), of the binomial expansion of
$$( 1 + p x ) ^ { 9 }$$
where \(p\) is a constant.
These first 3 terms are \(1,36 x\) and \(q x ^ { 2 }\), where \(q\) is a constant.
(b) Find the value of \(p\) and the value of \(q\).