how to solve sequence a(n)=12-3(n)
a(n)=12-3(n)
Substitute n=1: a(1) = 12-3(1) = 12-3 = 9
Substitute n=2: a(2) = 12-3(2) = 12-6 = 6
Substitute n=3: a(3) = 12-3(3) = 12-9 = 3
Substitute n=4: a(4) = 12-3(4) = 12-12 = 0
Substitute n=5: a(5) = 12-3(5) = 12-15 = -3
Substitute n=6: a(6) = 12-3(6) = 12-18 = -6
Substitute n=7: a(7) = 12-3(7) = 12-21 = -9
Substitute n=8: a(8) = 12-3(8) = 12-24 = -12
Substitute n=9: a(9) = 12-3(9) = 12-27 = -15
Substitute n=10: a(10) = 12-3(10) = 12-30 = -18
Substitute ............ etc., etc., etc.,
So the sequence is 9, 6, 3, 0, -3, -6, -9, -12, 15, -18, etc., etc., etc,.
Edwin