Question

If Sn =4n^2 - 3n, find An​

Answer 1

Step-by-step explanation:

sn=4n^2-3n

s1=4*1-3*1=1

s2=4*2^2-3*2=16-6=10

s3=4*3^2-3*3=36-9=27

a1=s1=1

a2=s2-s1=10-1=9

a3=s3-s2=27-10=17

first term=a=a1=1

common difference=d=a2-a1=9-1=8

n th term=an= a+(n-1)d

=1+(n-1)8

=1+8n-8

=8n-7