FOIL Pattern: A method based on the Distributive Property that is often used to multiply two binomials.
The Distributive Property can be used to multiply two
binomials. For example, (x + y)(b + c) means (x + y)b + (x + y)c because of the
Distributive Property (look at the definition of distributive property and replace a with
(x + y).) Then the Distributive Property can be used two more times to
get xb + yb + xc + yc. FOIL, described in detail below, is just a way to
remember the use of the Distributive Property in this situation. After you read
about FOIL, try the procedure to multiply (x + y) and (b + c). Do you get the same result as
given in this paragraph?
F means you multiply the first two terms together. O means you multiply
the outer terms together. I means you multiply the inner terms
together. L means you multiply the last two terms together.
In (a + b)(c + d), a and c are the
first terms since they appear first in each binomial. a and d are
the outer terms since they are on the left and right sides, respectively.
b and c are the inner terms since they appear in between the other
two terms. b and d are the last terms since they appear second in