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Conjugate expansion and product

Conjugate expansion and product

Secondary 2
3 marks
TGM Original Questions
  1. Expand \((7x-5)(7x+5)\).[1]
  2. Hence evaluate \(695\times705\) without a calculator.[2]

Solution:

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Answer:(a) \(49x^2-25\) (b) \(489,975\).

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