In this paper of “Pure Mathematics 1”, each question is fully solved, and all the steps are explained with relevant calculations and/or comments and diagrams.
In question 3, involving the “Binomial expansion”, there is a straightforward method leading to the final answer and then there is also an alternative technique which can become interesting for those who wish to explore further algebraic paths.
Hopefully, it will be useful when revising for examinations in this area.
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