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)

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

Related Worksheet

• Complementary,-Supplementary,-Vertical-and-adjacent-Angles-Gr-7
• Volume-of-Cylinders-Gr-8
• Converting-Units-Within-Customary-System-Gr-5
• Solving-and-Graphing-Linear-Inequalities-on-a-Number-Line-Gr-7
• Appropriate-Measures-of-Central-Tendency-for-the-Data-Gr-6