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semoga membantu ya :)
persamaan a tinggal di kali silang aja, jadi:
t(t-4) = (t+1) (t-1) , jika di jabarkan jadi
t²-4t = t² + t - t - 1
t²-4t = t² - 1
4t = 1
t = 1/4
yang soal (b) sama saja caranya