Grade 12Algebra
The sum of 10 terms of the series whose nth terms is n2 -5. Please help.
The sum of 10 terms of the series whose nth terms is n2 -5. Please help.
1 Answer
P S S C ASLESH
nth term of the series is n²-5
Sum of n terms=∑(n²-5)=∑n²-5
=n(n+1)(2n+1)/6 -5
n=10
Sum of 10 terms = 10(10+1)((2*10)+1)/6 -5
=(10*11*21)/6 -5
=2310/6 -5
=385-5
=380
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