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What is the (n)th term of the sequence (9,21,37,57,81,\ldots)?
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Answer and explanation
Correct answer: (2n^2+4n+3)
The second differences are (4), and (2n^2+4n+3) gives all starting terms. Half of the second difference gives the coefficient of (n^2).
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What is the correct answer to this question?
(2n^2+4n+3)
Why is this the correct answer?
The second differences are (4), and (2n^2+4n+3) gives all starting terms. Half of the second difference gives the coefficient of (n^2).
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Sequences and Progressions. Topic: nth term.
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