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2t²+t+4-2-4t-t² = 0
2t²-t²+t-4t+4-2 = 0
t² - 3t + 2 = 0
(t-2)(t-1) = 0
t=2 v t=1
pilihan jawaban E. 1 dan 2
Tentu:
t = 1 dan 2 [E]