Use foil to explain how to find the product of (a+b)(a-b). then describe a shortcut that you could use to get this product without using foil.

FOIL stands for Front Outter Inner Last

F- multiply the first two terms axa= a^2
O- multiply the two terms on the outside a x -b= -ab
I- multiply the two inner (middle) terms - b x a= ab
L- multiply the last variable in each term= b^2

A shortcut without using FOIL is called the difference of squares and can be rewrote as (a^2-b^2)