Question

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

Answer 1

Answer:

nth term is 7-4n

let n=1

7-4×1=3

let n=2

7-4×2= -1

therefore the ap is 3,-1...

d=a2-a1

-1-3=-4

therefore CD = -4

Answer 2

Answer:

-4

Step-by-step explanation:

an=7-4n

S1=7-4

=3

S2=7-8

=-1

d=-1-3

= -4