## If the sum of the First n term of an Ap is 4n2-3n . find first term and d . Find algebra. is 181 a term of this sequences? Find 25th term

Question

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## Answers ( )

sn=4n^2-3n

sn-1=4(n-1)^2-3(n-1)

sn-1=4(n^2-2n+1)-3n+3

sn-1=4n^2-8n+4-3n+3

sn-1=4n^2-11n+7

WE KNOW THAT,

tn=sn-sn-1

tn=(4n^2-3n)-(4n^2-11n+7)

tn=4n^2-3n-4n^2+11n-7

tn=8n-7

Therefore the nth term whose sn=4n^2-3n is 8n-7