Question

rationalise denominator 1 /root 18

Answer 1

$\sqrt{18 \div 18}$

Answer 2

$\frac{1}{ \sqrt{18} }$
$= > \frac{1 \times \sqrt{18} }{ \sqrt{18 \times \sqrt{18} } }$
$= > \frac{ \sqrt{18} }{18}$
$= > \frac{3 \sqrt{2} }{18}$
$= > \frac{ \sqrt{2} }{6}$