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t⁹ - t
t(t⁸ - 1)
t(t⁴ - 1)(t⁴ + 1)
t(t² - 1)(t² + 1)(t⁴ + 1)
t(t - 1)(t + 1)(t² + 1)(t⁴ + 1)
akar-akarnya :
t = 0
t - 1 = 0
t = 1
t + 1 = 0
t = -1
Jadi banyaknya akar riil f (t) = t⁹ - t ada 3