rasional kanlah (√6-3√2)²

(√6-3√2)²
= (√6-3√2) × (√6-3√2)
= √6(√6) - √6(3√2) - 3√2
√6 + 3√2 (3√2)
= 6 - 3√12 - 3√12 + 9 (2)
= 6 - 6√12 + 18
= 24 - 6√4 √3
= 24 - 6×2 √3
= 24 - 12 √3
= 12 (2-√3)

Semoga membantu ^__^

(√6 - 3√2)² = (√6 - 3√2) (√6 - 3√2)
                  = √6(√6) - √6 (3√2) - 3√2 (√6) + 3√2 (3√2)
                  = 6 - 3√12 - 3√12 + 9(2)
                  = 6 - 6√12 + 18
                  = 24 - 6 √4 √3
                  = 24 - 6.2 √3
                  = 24 - 12√3
                  = 12(2 - √3)