Corbettmaths - This video explains how to expand a pair of brackets using FOIL. It goes through a few examples including squaring a single bracket.
Practice Questions: http://corbettmaths.com/wp-content/uploads/2013/02/expanding-two-brackets-pdf1.pdf
Textbook Exercises: https://corbettmaths.com/wp-content/uploads/2013/02/expanding-two-brackets-pdf2.pdf
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