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⇔ (t - 2)² - (t - 2) - 12
⇔ misalkan p = t - 2
⇔ p² - p - 12
⇔ (p - 4)(p + 3)
⇔ (t - 2 - 4)(t - 2 + 3)
⇔ (t - 6)(t + 1)
Apabila soal ini ditulis sebagai berikut: (t - 2)² - (t - 2) - 12 = 0
maka (t - 6)(t + 1) = 0
diperoleh t = - 1 dan t = 6