Finding Value of an Expression
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
If 2x+y = 5 then 4x+2y is equal to:
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| Right Option : D | |||
| View Explanation | |||
If | |||
| Right Option : B | |||
| View Explanation | |||
Find the value of (1.3x + 2.5y) (1.3x - 2.5y) for x = -1 and y = 2 | |||
| Right Option : B | |||
| View Explanation | |||
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