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x = 3
Substitusikan x = 3, ke persamaan kuadra tsb,
ax² - 5x - 3 = 0
⇒ a(3)² - 5(3) - 3 = 0
⇒ 9a - 15 - 3 = 0
⇒ 9a - 18 = 0
⇒ 9a = 18
⇒ a = 18/9
⇒ a = 2
Terimakasih smeoga mmebantu