Find the indicated terms of the sequences whose nth terms are given by
(ii) an = -(n2 - 4); a4 and a11
Solution :
To find a4, we have to apply 4 instead of n.
To find a11, we have to apply 11 instead of n.
an = -(n2 - 4)
n = 4
a4 = -(42 - 4)
a4 = -(16 - 4)
= -12
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an = -(n2 - 4)
n = 11
a11 = -(112 - 4)
a11 = -(121 - 4)
= -117
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