Reduce the expression by rationalising it — task. Mathematics State Board, Class 9.

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(\sqrt{23} + \sqrt{5}) (\sqrt{23} - \sqrt{5})

$=$

{(\sqrt{23} - \sqrt{5})}^{2}

$=$

i

$2$

\sqrt{i}

\frac{5}{16 + \sqrt{31}}

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15. Reduce the expression by rationalising it