# What is a Math Expression

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A math expression is an expression where numbers and variables are combined together and they form terms. Plain numbers written in an expression are called constants because they are fixed and their value cannot be changed. Variables are represented by alphabets and they however can vary, and hence we can assign them different numbers as their values depending upon the given question. In a math expression, these constants and variables are combined using different operations such as addition, subtraction, multiplication and division and they help us to simplify or estimate their value.

Example 1:Find the value of the given math expression, x+ 6+ 3x– 4 when the value of ‘x’ is 2.

Given math expression: x+ 6+ 3x– 4

The value given here for the variable, ‘x’ is 2

This implies that we can plug-in the value of ‘2’ in the place of ‘x’ in the above given expression.

This gives: x+ 6+ 3x– 4->2+ 6+ (3* 2) – 4-> 2+ 6+ 6- 4 = 10

Therefore the value of the given math expression when x= 2 is 10.

Example 2: Find the value of the given math expression, 6p+ 8- 4p when the value of ‘p’ is -1.

Given math expression: 6p+ 8- 4p

The value given here for the variable, ‘p’ is -1.

This implies that we can plug-in the value of ‘-1’ in the place of ‘p’ in the above given expression.

This gives: 6p+ 8- 4p ->(6* -1) +8 - (4* -1) -> -6+ 8+ 4 = 6

Therefore the value of the given math expression when p= -1 is 6.