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

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

Solved Example on Expression

Ques: Evaluate the expression for x = 1. 2x2 + (x + 1)(x - 1) + 2(x - 3)

    Choices:
    A. 2
    B. 2
    C. 0
    D. 1
    Correct Answer: A

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