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Topic: Arithmetic sequence question
Replies: 1   Last Post: Mar 14, 2005 10:09 PM

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Geng Lei

Posts: 1
Registered: 3/14/05
Re: Arithmetic sequence question
Posted: Mar 14, 2005 10:09 PM
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I come from china, try to make friend with you!
let me answer your question!
S(n)=4n*n+3*n
S(n+1)=4*(n+1)*(n+1)+3*(n+1)
T(n+1)=4*(n+1)*(n+1)+3*(n+1)-4*n*n-3*n
=4(n*n+2*n+1)+3*n+3-4*n*n-3*n
=8*n+7
=8*(n+1)-1
T(n)=8*n-1
so the result is T(n)=8*n-1



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