Help your students prepare for their Maths GCSE with this free quadratic sequences worksheet of 35 questions and answers
Quadratic sequences are number sequences based on the square numbers. The differences between the terms increase or decrease by the same amount; this is called the second difference between the terms. Quadratic sequences tend to involve integers rather than decimals.
Quadratic sequences have an nth term formula which can be used to generate terms of the number sequence. The nth term rule can be used to find any missing terms in a quadratic sequence, similar to how the nth term of a linear sequence can be used.
The nth term of a quadratic sequence can be found by finding the first differences, and then working out the second differences. The second differences should all be the same. We then need to divide the second difference by 2 in order to work out the coefficient of the squared term of the nth term of this quadratic sequence. We can then compare this quadratic part of the sequence to the original sequence to create a separate linear sequence. The quadratic part and the linear part then combine to give the overall nth term of the quadratic sequence.
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