Edexcel AS Paper 1 2020 June — Question 13

Exam BoardEdexcel
ModuleAS Paper 1 (AS Paper 1)
Year2020
SessionJune
TopicProof
  1. (a) Prove that for all positive values of \(a\) and \(b\)
$$\frac { 4 a } { b } + \frac { b } { a } \geqslant 4$$ (b) Prove, by counter example, that this is not true for all values of \(a\) and \(b\).
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