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Basic Algebra Terms




Basic algebra terms you need to know are constants, variables, coefficients, terms, expressions, equations and quadratic equations. These are some algebra vocabulary that will be useful.

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Constants

A fixed quantity that does not change. For example: 3, –6, π, 1/2

Variables

A variable is a symbol that we assign to an unknown value. It is usually represented by letters such as x, y, or t. For example, we might say that l stands for the length of a rectangle and w stands for the width of the rectangle.

We use variables when we need to indicate how objects are related even though we may not know the exact values of the objects. For example, if we want to say that the length of a rectangle is 3 times the length of its width then we can write

l = 3 × w

Coefficients

The coefficient of a variable is the number that is placed in front of a variable.

For example, 3 × w can be written as 3w and 3 is the coefficient.

3w
Coefficient


Terms

A term can be any of the following:

  • a constant: e.g. 3, 10, π, 1/2
  • the product of a number (coefficient) and a variable: e.g. –3x, 11y, 2/3 a
  • the product of two or more variables: e.g. x2, xy, 2y2, 7xy

Like terms are terms that differ only in their numerical coefficients. For example: 3a, 22a, 2/3 a are like terms.

Expressions

An expression is made up of one or more terms.

For example:

3w + 4xy + 5

Equations

An equation consists of two expressions separated by an equal sign. The expression on one side of the equal sign has the same value as the expression on the other side.

For example:

4 + 6 = 5 × 2

l = 3 × w

3w + 4xy + 5 = 2w + 3


Quadratic Equations

A Quadratic Equation is an equation of the form:

ax2 + bx + c = 0, where a, b and c are numbers and a ≠ 0

For example:

x2 + 2x + 3 = 0

2x2 + 5x – 7 = 0

2x2 + 5x = 8     is a quadratic equation because it can be changed to 2x2 + 5x – 8 = 0

x2 + x = 0     is a quadratic with c = 0

2x27 = 0     is a quadratic with b = 0

2x + 3 = 0     is not a quadratic because a cannot be 0



 



Videos

How to Understand Algebraic Variables -
This video will show you how to understand algebraic variables.
In algebra, variables are placeholder letters (capitalized and lowercase) that represent the unknown, or what you're solving for. This video shows you what variables can look like and what they mean. Understanding variables help make algebra easier for you.



How to Understand the Vocabulary Of Algebra -
In this video you will learn how to understand the vocabulary of algebra.
Knowing the symbols and expressions used in algebra makes understanding algebra easier. This video explains some common algebra symbols and phrases, such equations, operations, variables, and constants
Expression, term, equation, operation, variable, constant, exponent, simplify, factor, solve



This video shows the differences between an algebraic expression and an algebraic equation. It also explains terms, coefficients and constants.

 

This video gives the following algebra vocabulary.
Operation, term, variable, coefficient, expression, equation



 



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