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akar x akar = akar hilang
(3√7 +√5) (3√7 - √5) = (3√7)² - (√5)²
(3√7 +√5) (3√7 - √5) = (9.7) - 5
(3√7 +√5) (3√7 - √5) = 63 - 5
(3√7 +√5) (3√7 - √5) = 58