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

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(\sqrt{23} + \sqrt{7}) (\sqrt{23} - \sqrt{7})

$=$

{(\sqrt{23} - \sqrt{7})}^{2}

$=$

i

$2$

\sqrt{i}

\frac{5}{15 + \sqrt{37}}

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12. Reduce the expression by rationalising it