﻿ Definition and examples expression | define expression - algebra - Free Math Dictionary Online

# Expression

## Definition of Expression

An Expression is a mathematical phrase that combines numbers and/or variables using mathematical operations.

An expression is a representation of a value; for example, variables and/or numerals that appear alone or in combination with operators are expressions.

### Example of Expression

##### The following are a few mathematical expressions.
• 5 + 6 - (3 + 2)/18
• a + b - c
• 7 + 34
• log3 (x + 1) + log3 (x - 3)

A. - 2
B. 2
C. 0
D. 1

### Solution:

Step 1: Substitute x = 1 in the expression 2x2 + (x + 1)(x - 1) + 2(x - 3) and then simplify.
Step 2: = 2 + 0 + (- 4)
Step 3: = - 2

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