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CBSE - VII
Application of Algebraic Expressions
Application of Algebraic Expressions
WAlgebraic expressions can be used to represent number patterns.
Lesson Demo
Algebraic expressions can be used to represent number patterns.
In the following example, we can find the relation between number of cones and the number of ice-cream scoops.
Number of cones (n) |
Number of ice-cream scoops (2n) |
1 |
2 |
2 |
4 |
3 |
6 |
4 |
8 |
. |
. |
Thus, we can find the value of an algebraic expression if the values of all the variables in the expression are known.
Example:
The value of the expression 
for 
is
In a similar way, we can write formulas for the perimeter and area for different geometrical figures using simple, easy-to-remember algebraic expressions.
Example:
- If s represents the side of a square, then its:
- Perimeter is 4s
- Area is
- If l represents the length and b represents the breadth of a rectangle, then its:
- Perimeter is
- Area is
