the 3rd and 9th terms of an ap are 4 and -8 respectively, which terms of this AP is zero
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a3=4
a9=-8
Now,
Applying elimination
a+2d=4
a+8d=-8
- - +
_________
-6d=12
d=-2
Putting d= -2 in a+2d=4
a=4-2(-2)
a=8
a9=-8
Now,
Applying elimination
a+2d=4
a+8d=-8
- - +
_________
-6d=12
d=-2
Putting d= -2 in a+2d=4
a=4-2(-2)
a=8
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