Expansion - Explanation with Area of Square (Question no.3)

1 comment:

  1. Yi Chieh:

    Good. The diagram is very clear.

    Hm... Actually you've skipped a step, which should be included if it's a viva voce. That is, to show the line that you subtract the parts (with the brackets, before opening up the brackets).

    How about the FOIL method working?
    Please insert the picture in this SAME post.