2025 IGCSE 0580 May/June P21 Q15

2025 IGCSE 0580 May/June P21 Q15

4 marks
  1. Expand and simplify.
    \((2-\sqrt5)(1-3\sqrt5)\)[2]
  2. Rationalise the denominator.
    Give your answer in its simplest form.
    \(\dfrac6{\sqrt{10}}\)[2]

Solution:

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Answer:(a) \(17-7\sqrt5\). (b) \(\dfrac{3\sqrt{10}}5\).

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