(7) power 2n + 3 - (49) power n + 2 / {(343) power n + 1} power2/3
(7) power 2n + 3 - (7) power 2 (n + 2) / {(7) power 3(n + 1)} power2/3
(7) power 2n + 3 - (7) power 2n + 4 / (7) power 3(n+1)2/3
[3(n+1)2/3]=(n+1)2
=2n + 2
by taking common,
7 power 2n+2 { (7) power 1 - (7) power 2} / (7) power 2n+ 1
7 power 2n + 1 is cancel because one is in divide
NOW,
7 power 1 - 7 power 2
7 - 49 = -42 ans
