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pakai cara abc
-b + √b² - 4ac / 2a
(=) -(-24) + √576 - 4.2.7 / 2.2
(=) 24 + √576 - 56 / 4
(=) 24 + √520 / 4
(=) 24 + 2√130 / 4
(=) 6 + 1/2√130
koefisien yang satu lagi
(=) 6 - 1/2√130