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) 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
an  =   -(n2 - 4)
n = 11
 a11  =   -(112 - 4)
 a11  =   -(121 - 4)
=  -117

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