Question

The sum of n tem of an AP is 4n2-n.The common difference is

Answer 1

Answer: when n=1

4(1)^2-1=3

So, a=3

When n=2

4(2)^2-2=14

So a+d=14-3

a+d=11

Therefore, d=a+d-a

d=11-3

d=8