11.1 Like and unlike terms

11.2 Addition and subtraction of algebraic expressions

11.3 Multiplication of Algebraic Expressions

11.4 Multiplying a monomial by a monomial

11.4.2 Multiplying three or more monomials

11.5 Multiplying a binomial or trinomial by a monomial

11.5.1 Multiplying a binomial by a monomial

11.5.2 Multiplying a trinomial by a monomial

11.6 Multiplying a binomial by a binomial or trinomial

11.6.1 Multiplying a binomial by a binomial

11.6.2 Multiplying a binomial by a trinomial

11.7 What is an identity?

11.8 Some important Identities

11.9 Application of Identities

11.10 Geometrical Verification of the identities

11.10.1 Geometrical Verification of the identity (a + b) 2 ≡ a2 + 2ab + b2

11.10.2 Geometrical Verification of the identity (a - b) 2 ≡ a2 − 2ab + b2

11.10.3 Geometrical Verification of the identity (a + b)(a – b) ≡ a2 − b2