Quelpr
2 marksThe Real Number System – ℝ

CAPE Pure Mathematics Unit 1 · May/June 2005 · Paper 1 · Question 3(a)

Without using calculators or tables, show that (sqrt(11) + sqrt(7)) = 4 / (sqrt(11) - sqrt(7)).

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 3(b)(i)Given that x + 1/x = 1, by considering (x + 1/x)^2, show that x^2 + 1/x^2 = -1.[2 marks]
  2. 3(b)(ii)Hence, or otherwise, find the value of x^3 + 1/x^3.[5 marks]

More practice: the rest of this paper · more The Real Number System – ℝ questions · all CAPE Pure Mathematics Unit 1 past papers