3. (a) Find the first 3 terms, in ascending powers of \(x\), of the binomial expansion of
$$( 2 - 3 x ) ^ { 6 }$$
giving each term in its simplest form.
(b) Hence, or otherwise, find the first 3 terms, in ascending powers of \(x\), of the expansion of
$$\left( 1 + \frac { x } { 2 } \right) ( 2 - 3 x ) ^ { 6 }$$