4. (a) Find the first three terms, in ascending powers of \(x\), of the binomial expansion of $$( 2 + p x ) ^ { 6 }$$ where \(p\) is a constant. Give each term in simplest form. Given that in the expansion of $$\left( 3 - \frac { 1 } { 2 } x \right) ( 2 + p x ) ^ { 6 }$$ the coefficient of \(x ^ { 2 }\) is \(- \frac { 3 } { 4 }\)
(b) find the possible values of \(p\).
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