Edexcel AS Paper 1 Specimen — Question 11

Exam BoardEdexcel
ModuleAS Paper 1 (AS Paper 1)
SessionSpecimen
TopicProof
  1. (a) Prove that for all positive values of \(x\) and \(y\)
$$\sqrt { x y } \leqslant \frac { x + y } { 2 }$$ (b) Prove by counter example that this is not true when \(x\) and \(y\) are both negative.
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