Learn how to expand product of two linear algebraic expressions with two terms each in brackets.
Use the above applet to visualize how you can do expansion by thinking in terms of lengths and widths of rectangles.

Reflection :
Can you summarize and say in your own words, how to expand the product of two algebraic expressions
(two terms each in brackets)?
Are you able to expand products of more than two algebraic expressions, and each of more than two terms?