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

If the volume of a rectangular prism V = lwh and surface area = 2 (lw) + 2(hw) + 2(lh), where l = length, h = height and w = width, then what is greater, if length = 8 cm, width = 10 cm and height = 6 cm ?

Right Option : A
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Question : 2

Find the value of (x+y)(x^2-xy+y^2) for x = -1 and y = 2

Right Option : C
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Question : 3

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

a^2-ab

Right Option : A
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