nth term of a quadratic sequence questions
… can seem extremely difficult, although in this video, I’ve tried to give you a fairly straightforward method to use. If you apply the same idea each time, you should be able to calculate an expression for the nth term with most of the questions in GCSE maths.
The whole idea is that you are creating an expression with the general form of “an² + bn + c.” This just means the ideal layout of the expression.
- You need to show the second difference – this number is 2 x a
- The difference between the first two numbers of the sequence is 3a + b
- The first number of the sequence is a + b + c
Use all this information and you should be able to work through. Reading this text is quite difficult to understand – it’s much easier when you’ve watched the videos!
Please note that these videos deal with quadratics – here’s a link through to the post on linear sequences.
If you’d like to ask for any more detail, or you’re not sure about anything, please do ask a question in the comments section.
All best with your studies.
Watch on YouTube