Describe a disadvantage of using the acronym foil.

A disadvantage is that it can't always be used so it can make you believe that you can do it while it is not always applicable. An example of that would be if you had expanding products with more than two multiplicands, or multiplicands with more than two summands. In that case you would have to do it differently.

The coordinates of point a right now is (-3,-1) you have to multiply these coordinates by a factor of 2 to get (-6,-2)