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Quadratic and Cubic Sequences




 
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How to find the nth term of a quadratic sequence?
When trying to find the nth term of a quadratic sequence, it will be of the form
an2 + bn + c
where a, b, c always satisfy the following equations
2a = 2nd difference (always constant)
3a + b = 2nd term - 1st term
a + b + c = 1st term

Example:
1. Find the nth term, Tn of this sequence
3, 10, 21, 36, 55, ...

2. Find the nth term, Tn of this sequence
0, 7, 20, 39, 64, ...

Nth term of a Quadratic Sequence
GCSE Maths revision Exam paper practice
Example:
(a) The nth term of a sequence is n2 - 2n.
Work out the first three terms of the sequence.

(b) Work out the nth term of the sequence 5, 6, 8, 11, 15, ...



Linear and Quadratic Nth Terms of Sequences
GCSE Maths revision Exam paper practice and help
AQA Linked Paired Pilot Methods 2 Higher Jan 2012 Question 11
Example:
(a)Work out the nth term of the sequence
6, 11, 16, 21, 21, ...

(b) Work out the nth term of the sequence.
9, 15, 23, 33, 45, ...
Nth Term of a Quadratic Sequence
Find the nth (general) term of a quadratic sequence by using a method of differences
Example:
What is the nth term of this quadratic sequence?
2, 17, 40, 71, 110, 157, ...
Nth Term of a Cubic Sequence
Find the nth (general) term of a cubic sequence by using a method of differences.
Example:
What is the nth term of this cubic sequence?
0, -12, -52, -132, -264, -460, ...


 

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