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.
Video Examples: Expression in Maths
Example of Expression
 5 + 6 � (3 + 2)/18
 a + b � c
 7 + 3^{4}
 log_{3} (x + 1) + log3 (x  3)
The following are a few mathematical expressions.
Solved Example on Expression
Ques: Evaluate the expression for x = 1. 2x^{2} + (x + 1)(x  1) + 2(x  3)
Choices:
A. � 2B. 2
C. 0
D. 1
Correct Answer: A
Solution:

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