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.

Examples of Expression

The following are a few mathematical expressions.

  •  5 + 6 – (3 + 2)/18
  • a + bc
  • 7 + 34
  • log3 (x + 1) + log3 (x - 3)
Solved Example on Expression

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

Related Terms for Expression

  • Variable
  • Constant
  • Operations