Question
Multiply: $12\sqrt{15}$ by $4\sqrt{3}$
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Answer
$12\sqrt{15}$ by $4\sqrt{3}$ $12\sqrt{15}\div4\sqrt{3}=\frac{12\sqrt{15}}{4\sqrt{3}}=\frac{3\sqrt{15}}{\sqrt{3}}=\frac{3\sqrt{15}\times\sqrt{3}}{\sqrt{3}\times\sqrt{3}}$ $=\frac{3\sqrt{15\times3}}{3}=\sqrt{3\times5\times3}=3\sqrt{5}$
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