Cara mengerjakan (√7+√3)(√7-√3)

(a+b)(a-b) = (a²-b²)
(√7+√3)(√7-√3) = √7²-√3² = 7-3 = 4
jik dijabarkan
(√7+√3)(√7-√3) =
√49-(√7.√3)+(√7.√3)-√9
= 7-3 = 4