Question

if the third and the 9th term of an A.P be 4 and -8 respectively, find which term is zero?

Answer 1

Here is your ans...☺️
a3= 4. ,. a9= -8 an=0
a+2d=4
a+8d=-8
- -. -
_________
6d=-12
d=-12/6
d=-2
a+2d=4
a+2(-2)=4
a-4=4
a=4+4
a=8

an=a+(n-1)d
0=8+(n-1)-2
8=(n-1)-2
-8/-2=(n-1)
4+1=n
5=n
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Answer 2

a= 8
n=5
this is your answer

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