tolong............. kak besok dikumpul :(

8. (√2 - 2√3)²
= 2 - 4√6 + 12 = 14 - 4√6

9. (√3 - 3√5) (√3 + 3√5)
= 3 - 45 = -42

10. (7√3 + 8√2) (6√3 + 5√2)
= 126 + 35√2 + 48√6 + 80
= 206 + 35√2 + 48√6