OCR C4 2008 June — Question 5

Exam BoardOCR
ModuleC4 (Core Mathematics 4)
Year2008
SessionJune
TopicGeneralised Binomial Theorem
TypeDirect quotient expansion
5
  1. Show that \(\sqrt { \frac { 1 - x } { 1 + x } } \approx 1 - x + \frac { 1 } { 2 } x ^ { 2 }\), for \(| x | < 1\).
  2. By taking \(x = \frac { 2 } { 7 }\), show that \(\sqrt { 5 } \approx \frac { 111 } { 49 }\).
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