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= 4√2 + 2 . 3√2 - 4
= 4√2 + 6√2 - 4
= 10√2 - 4
b) √486 + √54
= 9√6 + 3√6
= 12√6
c) 4√3 + 3√12
= 4√3 + 2 . 3√3
= 4√3 + 6√3
= 10√3