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Example: Forming Algebraic Expression

 Post to:   Explanation:

Addition is a mathematical operation that represents combining collections of objects together into a larger collection. It is signified by the plus sign (+). For example, in the picture on the right, there are 3 + 2 apples-meaning three apples and two other apples-which is the same as five apples. Therefore, 3 + 2 = 5 (Our solved example in mathguru.com uses this concept)

Besides counting fruits, addition can also represent combining other physical and abstract quantities using different kinds of numbers: negative numbers, fractions, irrational numbers, vectors, decimals and more. 3 + 2 = 5 with apples

Variable (mathematics)

In mathematics, a variable is a value that may change within the scope of a given problem or set of operations. (Our solved example in mathguru.com uses this concept)

http://en.wikipedia.org/wiki/Variable_(mathematics)