Algebraic expressions and identities

An algebraic expression is an expression built up from integer constants, variables, and the algebraic operations. In this chapter we will learn about expressions, factors, coefficients, monomials, binomials, and polynomials.
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An algebraic expression is a statement built up from constants, variables, and the algebraic operations like addition, subtraction, multiplication, and division.

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

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

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.