A combination of constants and variables connected by the arithmetic signs such as addition (+), subtraction(-), multiplication(x) and division(÷) is called Expressions in algebra.

1) 2x

This is an expression.

Here we have 4 terms : 2x

2) 3x + 2y - 4z

This is an expression.

Here we have 3 terms : 3x, 2y and -4z.

On the basis of number of terms, there are different types of expressions.

For example : 2xy, 5x , -2x, 3x

For example : x-y, 2a +b, 2x2 -8.

For example : 3x + 4y -z, 5xy + 4yz + 4 ,a + b –c.

For example : 5x +6y -2z +4 , a +2b – c +3d.

1) Two more than a.

a + 2

2) The sum of x and 2y.

x + 2y

3) Product of 4 and a.

4a

4) Divide y by 3.

y/3

5) Multiply 2 and a and add 5 to the result.

2a + 5

(i)4x

This is a monomial expression as it contains one term only.

(ii) x

This is a binomial expression as it contains two terms.

(iii) x

This is a binomial expression as it consists of two terms.

(iv) 3x

This is a trinomial as it contains three terms.

• Like and Unlike terms in Algebra

• Addition of algebraic-expressions

• Subtraction of algebraic-expressions

• Multiplication of algebraic-expressions

• Division of algebraic-expressions