6. (a) Find the first 3 terms in ascending powers of \(x\) of the binomial expansion of
$$( 2 + a x ) ^ { 6 }$$
where \(a\) is a non-zero constant. Give each term in its simplest form.
Given that, in the expansion, the coefficient of \(x\) is equal to the coefficient of \(x ^ { 2 }\)
(b) find the value of \(a\).