GROUPING SYMBOLS

About "Grouping symbols"

Grouping symbols :

By using the concept grouping-symbols, we can easily  evaluate an algebraic expression.

Grouping-symbols are, 

{ } - Braces 

( ) - Parentheses

[ ] - Brackets

They indicate that the expression within the grouping symbol is to be evaluated first.

If we have more than one grouping symbol, we have to evaluate the expression within the innermost grouping symbols

Let us see some example problems based on the above concept.

Example 1 :

Evaluate the following expression.

2(5) +  3(4 + 3)

Solution :

=  2(5) +  3(4 + 3)

=  2(5) +  3(7)

=  10 +  21

 =  31

Example 2 :

Evaluate the following expression.

2 [5 + (30 ÷ 6)²]

Solution :

=  2 [5 + (30 ÷ 6)²]

=  2 [5 + (5)²]

=  2 [5 + 25]

=  2 [30]

=  60

Example 3 :

Evaluate the following expression.

[7(2) - 4] + [9 + 8(4)]

Solution :

=  [7(2) - 4] + [9 + 8(4)]

=  [14 - 4] + [9 + 32]

=  10 + 41

=  51

Example 4 :

Evaluate the following expression.

[(4 ⋅3)²⋅5]/(9 + 3)

Solution :

=  [(4 ⋅3)² ⋅ 5]/(9 + 3)

=  [(7)² ⋅ 5] / (9 + 3)

=  [49 ⋅ 5] / (9 + 3)

=  245 / 12

Example 5 :

Evaluate the following expression.

4(11 + 7) - 9 ⋅ 8

Solution :

=  4(11 + 7) - 9 ⋅ 8

=  4(18) - 9 ⋅ 8

=  72 - 72

=  0

Example 6 :

Evaluate the following expression.

288 ÷ [3(9 + 3)]

Solution :

=  288 ÷ [3(9 + 3)]

=  288 ÷ [3(12)]

=  288 ÷ [36]

=  8

Example 7 :

Evaluate the following expression.

390 ÷  [5(7 + 6)]

Solution :

=  390 ÷  [5(7 + 6)]

=  390 ÷  [5(13)]

=  390 ÷  [45]

=  78/9

Example 8 :

Evaluate the following expression.

(4 ⋅ 6² - 4² ⋅ 6) / 4 ⋅ 6

Solution :

=  (4 ⋅ 6² - 4² ⋅ 6) / 4 ⋅ 6

=  (4 ⋅ 36 - 16 ⋅ 6) / 4 ⋅ 6

=  (144 - 96) / 24

=  48 / 24

=  2

Example 9 :

Evaluate the following expression.

(2 ⋅ 8² - 2² ⋅ 8) / 2 ⋅ 8

Solution :

=  (2 ⋅ 8² - 2² ⋅ 8) / 2 ⋅ 8

=  (2 ⋅ 64 -  4 ⋅ 8) / 2 ⋅ 8

=  (128 - 32) / 16

=  96 / 16

=  6

Example 10 :

Evaluate the following expression.

12(9 + 5) - 6 ⋅ 3

Solution :

=  12(9 + 5) - 6 ⋅ 3

=  12(14) - 18

=  168 - 18

=  150

After having gone through the stuff given above, we hope that the students would have understood "Grouping-symbols". 

Apart from the stuff given above, if you want to know more about "Grouping-symbols", please click here

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