The sum of n terms of an A.P is given by Sn=5nsquare+n square+3n,find the n th terms of A.P
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Answer:
Step-by-step explanation:
Sn=5n²+3n
We know that
an=Sn-Sn-1
=5n²+3n-[5(n-1)²+3(n-1)]
=5n²+3n-(5(n²-2n+1)+3n-3))
=5n²+3n-5n²+10n-5-3n+3
an=10n-2
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