Question

given a = 4.d = 2, S = -14, find n and a.​

Answer 1

Step-by-step explanation:

a=4 ,d=2,s=-14.

s=a+(n-1)d

-14=4+(n-1)2

-14-4=(n-1)2

-18/2=(n-1)

-9=(n-1)

-9+1=n

n=-8