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This question asks students to investigate the different numbers they can make by considering the difference of two squares and to generalise their results. They will also need to prove that all numbers of a certain form can be made, and that it is impossible to make numbers of another form.
Students will probably need to use the following information
There are lots of suggestions for support for students in the What's Possible? Teacher notes.
Here is a list of number theory problems.
Students could also consider how they could write all numbers as a difference of two squares if they relax the "integer" condition.
How many ways are there to write any number as a difference of two squares?