Algebraic Expansion: How it really works


  1. Darryl:

    For the first part, you have labelled the lengths correctly and shaded the part that (x-9)^2 represents. However, you have not moved on to find the areas of each part of the rectangle.
    You'll need to find the area of the unshaded rectangles and do the subtraction to show how to obtain the answer.
    Please re-post this part.

    In the 2nd image, the FOIL method has been correctly applied. However, moving on to the 3rd line of the working, how did you obtain 17x^2?

    Please check and re-post your answer in this SAME post.

  2. Darryl:
    One more part... check your image if it needs to be flipped before posting.