Like terms

Like terms

In algebra, like terms are terms that have the same variables and powers. The coefficients do not need to match.[1]

Unlike terms are two or more terms that are not like terms, i.e. they do not have the same variables or powers. The order of the variables does not matter unless there is a power. For example, 8xyz2 and −5xyz2 are like terms because they have the same variables and power while 3abc and 3ghi are unlike terms because they have different variables. Since the coefficient doesn't affect likeness, all constant terms are like terms.

Combination

If all terms in an expression are like terms, the expression can be simplified, or rewritten as a fraction or equation for mathematical purposes. For example, 2a,2a are the same number and variable making it a like term.

Each term has the same literal factor, x². Only the coefficients are different. The coefficient of x² in the first term is 4. The coefficient in the second term is −5. We include the minus sign. See Naming terms in Lesson 3. And in the last term, the coefficient of x² is undertood to be 1. For, x² = 1x².

Here, on the other hand, is a sum of unlike terms:

x² − 2xy + y²

Footnotes

  1. ^ "Like terms in Depth". Math Online. Math Online. http://www.math.com/school/subject2/lessons/S2U2L4DP.html. Retrieved 2008-09-07.