Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\sqrt{ 7 } \times \sqrt{ 63 }$$

Answer

21

Solution


Simplify  \(\sqrt{63}\)  to  \(3\sqrt{7}\).
\[\sqrt{7}\times 3\sqrt{7}\]
Simplify.
\[3\sqrt{7\times 7}\]
Simplify  \(7\times 7\)  to  \(49\).
\[3\sqrt{49}\]
Since \(7\times 7=49\), the square root of \(49\) is \(7\).
\[3\times 7\]
Simplify.
\[21\]
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