Question

find the series of 1nth term when Sn=3n2+4n

Answer 1

Answer:

a=7 ....it is the first term.......

Answer 2

s1=3×1²+4×1

=7

so, x1=7

s2=3×2²+4×2

=3×4+8

=20

so, x2=20-7

=13

d=13-7

=6

so the series is

7,13,19,........