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Numbers System — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsNumbers System2 Marks
Question
Multiply: $18\sqrt{21}$ by $6\sqrt{7}$
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Answer

$18\sqrt{21}$ by $6\sqrt{7}$ $18\sqrt{21}\div6\sqrt{7}=\frac{18\sqrt{21}}{6\sqrt{7}}=\frac{3\sqrt{21}}{\sqrt{7}}=\frac{3\sqrt{21}\times\sqrt{7}}{\sqrt{7}\times\sqrt{7}}$ $=\frac{3\sqrt{3\times7\times7}}{7}=\frac{3\times7\sqrt{3}}{7}=3\sqrt{3}$

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