Finding Value of an Expression


 
 
Concept Explanation
 

Finding The Value of an Expression

The value of an algebraic expression depends on the values of the variables forming the expression.There are a number of situation in which we need to find the value of an expression, such as when we wish to check whether a particular value of a variable satisfies a given equation or not.

We find values of expressions, also, when we use formulas from geometry and form everyday mathematics.

Illustration: Find the value of the expression x+ 4 when x=2.

Solution: Putting x=2 In x+4,

we get the value of x+4 =  2 + 4 = 6

Illustration: Find the value of the expression 4x - 3 when x= 2

Solution  Putting x = 2 In 4x - 3,

We get the value of  4x-3 = 4 X 2 - 3 = 8 - 3 = 5

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Sample Questions
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Question : 1

Find the value of the following expressions when a = 2, b = 2

a^2-2ab+b^2

Right Option : A
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Question : 2

Find the values of (p-3q) (3p-q) for p=2, q=3

Right Option : B
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Question : 3

If a = 1,b = -1, find the value of:

3a^2-3b^2-1

Right Option : C
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