If the sum of the first n terms of the sequence {an} is Sn = 2An + 3, then an is an equal ratio sequence Give reasons

If the sum of the first n terms of the sequence {an} is Sn = 2An + 3, then an is an equal ratio sequence Give reasons

Sn-S(n-1)
=an
=2an+3-2a(n-1)-3
=2an-2a(n-1)
an=2a(n-1)
The common ratio is 2