mohon bantuan untuk menyederhanakan

1.
→ √180 = √(36 x 5) = 6√5
→ √9a²b = √(9a² x b) = 3a√b
→ 2√27a²b² = 2√(9a²b² x 3) = 2 x 3ab√3 = 6ab√3

2.
→ 7√2 - 6√3 + √3 - 3√2 = 7√2 - 3√2 - 6√3 + √3 = 4√2 - 5√3
→ 5√3 + 6√2 + √32 - 3√27 = 5√3 + 6√2 + √(16x2) - 3√(9x3) = 5√3 + 6√2 + 4√2 - 9√3 = 10√2 - 4√3
→ √6 + √72 - 3√32 - √24 = √6 + √(36x2) - 3√(16x2) - √(4x6) = √6 + 6√2 - 12√2 - 2√6 = -√6 - 6√2

3.
(2√3 + 3√2)² = (2√3)² + 2 . 2√3 . 3√2 + (3√2)² = 12 + 12√6 + 18 = 30 + 12√6
= 6(5 + 2√6)

4.
(5√2 - 2)² = (√5)² - 2 . 2 . 5√2 + 2² = 5 - 20√2 + 4 = 9 - 20√2