A hint to get started
Practise finite and nonterminating binomial expansions
Expand the following as a series in ascending powers of x, up to and including the term in , stating the set of values of x for which the expansion is valid.
(a)
(b)
(c)
CJC · Lecture · Self-Practice 1
Make the bracket start with 1, choose ascending powers of x, and transform the convergence condition while retaining the original domain.