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

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1.

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

$=$

2.

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

$=$

$i$

$2$

$\sqrt{i}$

3.

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

$\frac{5 (15 - \sqrt{37})}{188}$
$\frac{5 (15 + \sqrt{37})}{37}$
$\frac{5 (15 - \sqrt{37})}{15}$

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