Use FOIL to solve the problem (x-2)(x+2) last ?
1) Do x times x =
2) Do x times 2 =
3) Do -2 times x =
4) Do -2 times 2 = -4
5) Put all of those terms in order
6) Add or subtract like terms
This is a different format but is still foil
Multiply everything inside the right brackets by everything in the left.
What follows is really worth committing to memory. It shows up a lot!