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4 votes
4 radical 7 * 2 radical 10

1 Answer

5 votes
remember
(ab)(cd)=(a)(b)(c)(d)
and
(√a)(√b)=√(ab)

so
(4√7)(2√10)=(4)(√7)(2)(√10)=(4)(2)(√7)(√10)=(8)(√70)=8√70
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