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What is the general term of the sequence (4,27,64,115,\ldots)?
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Answer and explanation
Correct answer: (a_n=7n^2+2n-5)
(7n^2+2n-5) gives (4,27,64,115). In exams choose a quadratic rule when second differences are constant.
Frequently asked questions
What is the correct answer to this question?
(a_n=7n^2+2n-5)
Why is this the correct answer?
(7n^2+2n-5) gives (4,27,64,115). In exams choose a quadratic rule when second differences are constant.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Sequences and Progressions. Topic: Explicit or general rule.
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