maths

記T(n)為general term(通項), 則T(1) = 30 .....................(1)
T(2) = 38 = T(1) + 8 .....(2)
T(3) = 46 = T(2) + 8 .....(3)
T(4) = 54 = T(3) + 8 .....(4)
.........................................
T(n) = T(n-1) + 8 ..........(n)(1) + (2) + (3) + (4) + ... + (n) : T(1) + T(2) + T(3) + T(4) + ... + T(n) = 30 + T(1)+8 + T(2)+8 + T(3)+8 + ... +T(n-1)+8T(n) = 30 + 8(n-1) = 8n - 22

2014-10-08 05:19:30 補充：
修正 : T(n) = 30 + 8(n-1) = 8n + 22

請作答吧．．．．．．

General term
= 30 + 8(n-1)
= 30 - 8 + 8n
= 8n + 22