The subject is maths and it is about algebra.I want to know why there is a answer with bracket sometime?

Question

The ans sometime there may be a bracket surroundin the algebra answer.Lets say as the algebra answer is 12b-1 and with the bracket surrounding it ,it is like this:(12b-1).This is a example for u everyone and i hope that u may understand wat i am traying to ask.

Thx for some of your answer and i still don get it i hope that u every1 will make it more detail

Answer 1

In this case I do not know why you would need the parentheses around your answer. all of the other people are right, they may just not be saying it clearly enough so I will try.

for all equations and math you need to do some things first to get the right answer.

If you have not had exponents yet ignore this but you do them first. like x squared x^2 . do these first if you dont have any forget it

after that do what is inside of the brackets.

example:
(5x+1)*2
first multiply 5 times x, then add the one, then multiply by 2.

if x=2
5 times 2 = 10
add one =11
multiply by 2 =22


if you ignore the parentheses your answer will be 1 which is wrong.


just do what is inside the parentheses first. then do the rest of the equation, to make it easier you can rewrite the one I did above step by step on your paper to make sure you get it right

(5x+1)*2
(5*2+1)*2
(10+1)*2
11*2
22

hope this helps

Answer 2

If the expression (in your case: 12b-1) is an answer or it is used remotely, then both are the same.
However, if the expression is to be used in other expressions or in an algebraic manipulation (plus,minus,multiplication etc..), then they are different.
For example, pre-multiplying the expression by 3 in
(a) 12b-1 is equivalent to 3*12b-1=36b-1
(b) (12b-1) equivalent to 3*(12b-1)=36b-3

Answer 3

well that is because 12b-1 is a totally different expression than (12b-1). in the one with the brackets if u multipy something to it the entire thing gets mulitpied by that: 3(12b-1)
36b-3.... if u have 12b-1 u dont multipy everything.;..

i hope that answers ur question!

Answer 4

It is to make it clear that the answer isn't 12(b-1), which means do the subtraction first and then multiply by 12. The example you gave means do the multiplication first and then subtract the 1.

The answer you gave means (12 x b) - 1
12(b-1) means (12 x b) - (12 x 1) = (12 x b) - 12

so the () are sometimes used to show the difference

Answer 5

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Answer 6

b is an unknown number
If written as:-
12b - 1
this means (12 x b) - 1

If written as:-
12 (b - 1)
this means 12 x (b-1)

Consider a few examples:-

value of b_____12b - 1_____12(b - 1)
5_____________59_________48
2_____________23_________12
10____________119________108
4_____________47_________36