Ask Me Help Desk - Radical ressions

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radical ressions

simplify this radical expression by multiplying the square root of 3 by 3 square root 21

$3\sqrt{3}\cdot\sqrt{21}$

$3\sqrt{63}$

$3\sqrt{9\cdot{7}}$

$9\sqrt{7}$

May I ask, what is a 'ression'? Is that short for expression? :):)

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