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Dit: Nilai C = ?
penye: D = b^2 - 4ac
-15 = 5^2 - 4.2.c
-15 = 25 - 8c
-15-25 = -8c
-40 = -8c
C = 5..
Jadi, nilai c dati persamaan 2x^2 + 5x + c = 0 adalah 5