Let \(f(x) = \frac{24x + 13}{(1 - 2x)(2 + x)^2}\).

(a) Express \(f(x)\) in partial fractions.

(b) Hence obtain the expansion of \(f(x)\) in ascending powers of \(x\), up to and including the term in \(x^2\).

(c) State the set of values of \(x\) for which the expansion in (b) is valid.