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Verified answer
2x² - 4x - k = 0a = 2
b = -4
c = -k
Akan mempunyai akar imajiner jika
D < 0
b² - 4ac < 0
(-4)² - 4(2)(-k) < 0
16 + 8k < 0
8k < -16
k < -2