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a = 3, b = -5
maka
D = 49
⇒ b² - 4ac = 49
⇒ (-5)² - 4(3)(c) = 49
⇒ 25 - 12c = 49
⇒ 12c = 25 - 49
⇒ 12c = -24
⇒ c = -24/12
⇒ c = -2
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