Khan Academy Static

Addition_and_subtraction_of_algebraic_expressions

You have already studied how to add and subtract algebraic expressions in grade 7, let's see how much you remember!

What_are_expressions_

An algebraic expression is a statement built up from integer constants, variables, and the algebraic operations like addition, subtraction, multiplication, and division.

Standard_identities

An identity is an equality, which is true for all values of the variables in the equality. Here we will learn three standard identities- (a+b)^2=a^2+b^2+2ab, (a-b)^2=a^2+b^2-2ab, (a+b)(a-b)=a^2-b^2.

Multiplying_a_monomial_by_a_monomial

Here we will learn multiplication of monomials by finding area of rectangle.

Multiplying_a_polynomial_by_a_polynomial

Here we will learn how to multiply a polynomial with a polynomial, a binomial with a binomial, and a binomial with a trinomial.

Multiplying_a_monomial_by_a_polynomial

Here we will learn how to multiply a monomial with a polynomial.