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divide 18 under root 21 by 6 under root 7

\frac{18 \sqrt{21}}{6 \sqrt{7}} = \frac{3 \sqrt{21}}{\sqrt{7}} = \frac{3 \sqrt{21}}{\sqrt{7}} \times \frac{\sqrt{7}}{\sqrt{7}} [Rationalising the denominator] = \frac{3 \sqrt{21 \times 7}}{7} = \frac{3 \sqrt{7 \times 7 \times 3}}{7} = \frac{3 \times 7 \sqrt{3}}{7} = 3 \sqrt{3}

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