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= 3√6 x 3√5 + 3√6 x √80
= 9 √6x5 + 3√6x80
= 9√30 + 3√480
= 9√30 + 3√16 x 30
= 9√30 + 3 x √16 x √30
= 9√30 + 3 x 4 x √30
= 9√30 + 12√30
= (9+12)√30
= 21√30
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