Hitunglah n barisan d bawa ini: a) Un= n² -9 =0 b) Un= n² -n =6 c) Un= n² -4n=12 Bantu yaa

faktorkan, ambil yg positif
a. n² = 9 ---> n = ±√9 = ±3 ---> n = 3
b. n²- n - 6 = 0 ---> (n - 3)(x + 2) = 0 ---> n = 3
c. n² - 4x - 12 = 0 ---> (n - 6)(n + 2) = 0 ---> n = 6