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= 2√18 - 4√12
= 2√9×2 - 4√4×3
= 2×3√2 - 4×2√3
= 6√2 - 8√3
2. (2√3 - 3√2) (2√3 + 3√2)
= 4√9 + 6√6 - 6√6 - 9√4
= 4√9 - 9√4
= 4×3 - 9×2
= 12 - 18
= -5
3. (3√5 + 4√2) (3√5 - 4√2)
= 9√25 - 12√10 + 12√10 - 16√4
= 9√25 - 16√4
= 9×5 - 16×2
= 45 - 32
= 13
4. (4√2 - 3) (4√2 + 2)
= 16√4 + 8√2 - 12√2 - 6
= 16√4 + (8-12)√2 - 6
= 16√4 - 4√2 - 6
= 16×2 - 4√2 - 6
= 32 - 4√2 - 6
= 32 - 6 - 4√2
= 26 - 4√2