What is the square root of $84$ ?

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Solution

Ans. $2 \sqrt{21}$
$\sqrt{84}$ $= \sqrt{2^{2} (3) (7)}$
Pull out the pair of tow's that are in common and place them on the outside of the radical.
Inside the radical, you are left with $(3) (7) = 21$
Hence, $\sqrt{84} = 2 \sqrt{21}$

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