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Verified answer
Materi : barisan aritmatikajawab :
Sn= 3n² -n
S1= U1 = 3(1)²-1 = 2
S2 = 3(2)²-2 = 10
U2 = S2 - S1 = 10-2 = 8
b = u2-u1 = 8-2 = 6
Jadi
Un = U1 + (n-1) b
Un = 2 + (n-1)6
Un = 6n -4