# What Does Evaluate The Expression Mean

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An expression is an algebraic term which consists of constants (numbers) or variables and they are combined together by different operations such as addition, subtraction, multiplication or division. An expression can contain as many terms as required, and to evaluate the value of the expression means to calculate what the expression equals to after performing the operations. If the value of the variable is mentioned, then we can plug-in the given value in the place of the variable and we can evaluate the expression!

Example 1: Evaluate the expression, 5x + 3 + 4x – 7 if given x = 2.
Given expression: 5x + 3 + 4x – 7 and x = 2
Now in order to evaluate the value of the expression, we can simply plug-in ‘2’ in the place of ‘x’ in the given expression.
This implies: 5x + 3 + 4x – 7 ==> 5(2) + 3 + 4(2) – 7 ==> 10 + 3 + 8 – 7 = 14
Therefore the value of the given expression when x = 2 is 14

Example 2: Evaluate the expression, 3 – 2b + 7b + 5 if given b = 1.
Given expression: 3 – 2b + 7b + 5 and b = 1.
Now in order to evaluate the value of the expression, we can simply plug-in ‘1’ in the place of ‘b’ in the given expression.
This implies: 3 – 2b + 7b + 5 ==> 3 – 2(1) + 7(1) + 5 ==> 3 – 2 + 7 + 5 = 13
Therefore the value of the given expression when b = 1 is 13