Question

please explain the steps marked ##


: Find the general term and sum of n terms of the series 9 + 16 + 29 +54 + 103 +
Let S = 9 + 16 + 29 +54 + 103 +
+ T
S = 9 + 16 + 29 + 54 + 103 + +T
(1)-(i) = T = 9 + 7 +13 + 25 +49 +
+(T.-T)
T = 9 + 7 + 13 + 25 +49 + + (T-T-2) + (T. -T._)
(iii) – (iv) = T.-T = 9+ (-2) + 6+12+24+........ = 7 +6 [21-2 – 1] = 6(2)n-2 + 1. ##
(n-2) terms
General term is T. = 6(2)n-1 +n + 2 ##
(
2-1) n (n+1)
n(n+5)##
S = ET, = 621-1 + En + x2 = 6 .
+
+ 2n = 6(2" - 1) +
2-1
2
2.
?
m

​

Answer 1

Answer:

i don't understand the question.........

help