Edexcel Paper 1 2020 October — Question 16

Exam BoardEdexcel
ModulePaper 1 (Paper 1)
Year2020
SessionOctober
TopicProof
  1. Prove by contradiction that there are no positive integers \(p\) and \(q\) such that
$$4 p ^ { 2 } - q ^ { 2 } = 25$$
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