Types of algebraic expressions. Polynomials

Polynomial (poly - 'many', nomial - 'term').

 When an algebraic expression has one or many terms, then that expression is called a polynomial expression.
In some cases, polynomial multiplication can be performed easier when using the abridged multiplication formulas.

You need to remember 3 formulas:

1) The square of the sum of two expressions:
(a+b)2=a2+2ab+b2

2) The square of the difference of two expressions:
(a−b)2=a2−2ab+b2

3)  The difference of squares of two expressions:
(a−b)(a+b)=a2−b2