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Verified answer
= (3√2 + √6)(3√2 - √6)= 9√4 - 3√12 + 3√12 - √36
= 9(2) - 6
= 18 - 6
= 12
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= 9√4- 3√12 + 3√12 - √36
= 9.2 - 6
= 18 - 6
= 12