Question

if the 3th term and 9th term of an ap are 4 and - 8 respectively which term of this zero​

Answer 1

Answer:

Step-by-step explanation:

a₃=a +2d=4

a₉=a+8d=-8

  a+2d=4

- a-8d=+8  

=-6d=12

d=-2

a+2(-2)=4

a=2(2)+4=8

an=a+(n-1)d

0=8+(n-1)-2

-8/-2=(n-1)

4=n-1

n=5