Question

The sum of n terms of an ap

is 2n² + 5n then its nth term is


​

Answer 1

Answer:

sum is given by 2n^2+5n

put n=1 then it is 7

means 1 term is 7

put n=2

then it is 18

means

2 term is 18-7. =11

then

AP

is

7,11,15,19

nth term is a+(n-1)d

here a=7

d=4

then

it is =7+(n-1)4

=7+4n-4

=3+4n

ok

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