Question

the nth term of an ap is 7-4n. find the common difference

Answer 1

an=7-4n
then let, n=1
=>a1=7-4(1)
=7-4=3
and a2=7-4(2)
=7-8=-1
then, d=a2-a1
=-1-(3)
d=-4

Answer 2

Hii frnd...

$a_{n}=a+(n-1)d$

When n is 1.
a = 7-4 = 3.
When n is 2.
$a_{2}$ = 7-8 = -1.

Common difference = $a_{2}-a$
= -1 - 3
= -4

Hope it helped u!!!