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Definition of algebraic expression. : an expression obtained by a finite number of the fundamental operations of algebra upon symbols representing numbers.
C=Ïd (circumference of a circle) An expression is a group of mathematical symbols representing a number or quantity. Expressions never have equality or inequality signs like =, >, <, â  ,â¥ ,â¤. Some examples. 3a. 3xy + 4x. tÂ² + tÂ³. An identity is an equation that is always true, no matter what values are chosen.