2025 IGCSE 0580 October/November P21 Q21

2025 IGCSE 0580 October/November P21 Q21

4 marks
  1. \((3-\sqrt5)(2+3\sqrt5)=a+b\sqrt5\)
    Find the value of \(a\) and the value of \(b\).[2]
  2. Rationalise the denominator.
    Write your answer in its simplest form.
    \(\dfrac6{\sqrt2}\)[2]

Solution:

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Answer:(a) \(a=-9,b=7\). (b) \(3\sqrt2\).

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