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Difference of squares under a root

Difference of squares under a root

Secondary 2
4 marks
TGM Original Questions

Optional extension

  1. Factorise \(p^2-q^2\).[1]
  2. Hence evaluate exactly \(\sqrt{8.6^2-1.4^2}\) without a calculator.[3]

Solution:

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Answer:(a) \((p-q)(p+q)\) (b) \(6\sqrt2\).

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