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(2 - 3t)x² + (4 - t)x + 2 = 0
a = (2 - 3t)
b = (4 - t)
c = 2
syarat D < 0
b² - 4ac < 0
(4 - t)² - 4(2 - 3t).2 < 0
16 - 8t + t² - 16 + 24t < 0
t² + 16 < 0
(t - 4)(t + 4)< 0
t - 4 < 0 atau t + 4 < 0
t < 4 atau t < -4