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D = 16
b²-4ac = 16
(-8)²-4.3.k = 16
64-12k = 16
12k = 64-16
12k = 48
k = 48/12
k = 4
16 = (-8)² - 4 x 3 x k
16 = 64 - 12k
k = 48/12 = 4
^^