Question 2 - A-Level Maths

Exam Board	OCR
Module	C4 (Core Mathematics 4)
Session	Specimen
Topic	Generalised Binomial Theorem
Type	Expand and state validity

Expand \(( 1 - 2 x ) ^ { - \frac { 1 } { 2 } }\) in ascending powers of \(x\), up to and including the term in \(x ^ { 3 }\).
State the set of values for which the expansion in part (i) is valid.