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Find the indicated terms of the sequences whose nth terms are given by (ii) an = -(n2 - 4); a4 and a11
Find the indicated terms of the sequences whose nth terms are given by
(ii) a
n
= -(n
2
- 4); a
4
and a
11
Solution :
To find a
4
, we have to apply 4 instead of n.
To find a
11
, we have to apply 11 instead of n.
a
n
= -(n
2
- 4)
n = 4
a
4
= -(4
2
- 4)
a
4
= -(16 - 4)
= -12
a
n
= -(n
2
- 4)
n = 11
a
11
= -(11
2
- 4)
a
11
= -(121 - 4)
= -117
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