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a). 2(√5 + √3)(√5 - √3) seperti
(a + b) (a - b) = a² - b² = 2{(√5)² - (√3)²} =
2(5 - 3) = 2 × 2 = 4
b). (√5 + √3)² + (√5 - √3)² =
. (5 + 2√15 + 3) + (5 - 2√15 + 3) =
(8 + 2√15) + (8 - 2√15) =
8 + 2√15 + 8 - 2√15 = 16
c). (a + b)(a - b) = (√5 + √3 + √5 - √3) × (√5 + √3 - √5 + √3)
(2√5) × (2√3) = 4√15
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