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Numbers System — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsNumbers System2 Marks
Question
Multiply:
$3\sqrt{28}$ by $2\sqrt{7}$
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Answer

$3\sqrt{28}$ by $2\sqrt{7}$
$3\sqrt{28}\times2\sqrt{7}=3\times2\times\sqrt{28}\times\sqrt{7}$
$=6\times\sqrt{28\times7}$
$=6\times\sqrt{2\times2\times7\times7}$
$=(6\times2\times4)=84$

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