I have no idea but you need better wording
Answer:
21√10
Explanation:
√3 x 7√30
= 7 √30 x 2
= 7√90
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Simplifying 7√90
7√90
= 7 √9 x √10
= 7 x 3 x √10
= 21 x √10
= 21√10
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