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Verified answer
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Verified answer
(3√5 - 7√6)²= (3√5 - 7√6) (3√5 - 7√6)
= 9√25 - 21√30 - 21√30 + 49√36
= 9(5) - 21√30 - 21√30 + 49(6)
= 45 - 42√30 + 294
= 339 - 42√30