]]>
LearnNext
Get a free home demo of LearnNext

Available for CBSE, ICSE and State Board syllabus.
Call our LearnNext Expert on 1800 419 1234 (tollfree)
OR submit details below for a call back

clear

Algebraic Expressions

1,42,934 Views
Have a doubt? Clear it now.
live_help Have a doubt, Ask our Expert Ask Now
format_list_bulleted Take this Lesson Test Start Test

Algebraic Expressions - Lesson Summary

Constant
A symbol having a fixed numerical value is called a constant.

Variable
A symbol which takes various numerical values is called a variable.

Algebraic expression
An expression having one or more variables is called an algebraic expression.

An algebraic expression may or may not contain mathematical operators like the symbols of addition, subtraction and multiplication. The quantities in an algebraic expression - variable, constant or combinations of both, joined by plus or minus signs, are called its terms.

The elements whose product forms a term of an algebraic expression are called the factors of that term.  The numerical factor of a term containing a variable is called the coefficient of the term.





Monomials:
Algebraic expressions that contain only one term are called monomials.

          4x -1
          7x 2
          10xyz

Binomials:
Algebraic expressions that contain only two terms are called binomials.

     7+3x
     2x ½ + 3y 2
     6x 2 + 7y

Trinomials:
Algebraic expressions that contain only three terms are called trinomials.

      5 + 2x - 3y
      x + 2y 2 - 9
      x 2+y -2 - 2z 2

Polynomials:
Algebraic expressions with all variables having whole number exponents or powers are called polynomials. The expressions in which the powers of variables are negative or rational numbers are not polynomials.



Like terms:
Terms that have the same power of the same variable are called like terms.



Unlike terms:
Terms that do not contain the same power of the same variable are called unlike terms.



To add or subtract algebraic expressions
  1. Arrange the expressions in separate rows, so that all like terms are one below the other and all unlike terms are in separate columns.
  2. Write all terms with their correct positive or negative signs.
  3. While subtracting, keep in mind how the minus sign between the expressions changes the signs of the terms of the expression being subtracted.

Comments(0)

Feel the LearnNext Experience on App

Download app, watch sample animated video lessons and get a free trial.

Desktop Download Now
Tablet
Mobile
Try LearnNext at home

Get a free home demo. Book an appointment now!

GET DEMO AT HOME