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Mathematics
14 October, 11:01
N th term of quadratic sequence 3, 11, 25, 45
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Alice Moses
14 October, 11:12
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The first differences are 8, 14, 20.
The second differences are 6.
Half of 6 is 3, so the first term of the sequence is 3n^2.
If you subtract 3n^2 from the sequence you get 0,-1,-2,-3 which has the nth term of - n + 1.
Therefore your final answer will be 3n^2 - n + 1
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