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 Post subject: help with algebra
PostPosted: Thu Feb 14, 2013 4:23 pm 
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Joined: Mon Dec 31, 2012 9:39 am
Posts: 3
Hi can anyone help with a simple problem, as I am not sure I am helping my dd correctly

2dr²p

Should the above be re-written as

2xdxrxrxp
or
2xdx(rxr)xp

or does it not matter?


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 Post subject: Re: help with algebra
PostPosted: Thu Feb 14, 2013 4:49 pm 
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Joined: Sun Sep 23, 2012 6:58 pm
Posts: 208
2dr²p

is equivalent to

2 * d * r * r * p

No brackets are required, since all the operations are the same (multiplication).

Extra brackets can be useful, as in for example

((2 + 6) * 3) +
((3 + 4) * 4)

which is clearer than

(2 + 6) * 3 + (3 + 4) * 4

even though it gives the same answer

But in this case brackets, while not changing the result, are undesirable.


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 Post subject: Re: help with algebra
PostPosted: Thu Feb 14, 2013 4:57 pm 
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Joined: Mon Dec 31, 2012 9:39 am
Posts: 3
Thanks for the swift response :D


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 Post subject: Re: help with algebra
PostPosted: Fri Feb 15, 2013 9:20 pm 
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Joined: Mon Dec 31, 2012 9:39 am
Posts: 3
hi again
Can you help with another one

7+4x3 = 19
Does this need the brackets i.e
7+(4x3) = 19

or do we assume that in BODMAS multiplication comes before addition etc so we don't need to show the brackets ?


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 Post subject: Re: help with algebra
PostPosted: Sat Feb 16, 2013 7:08 pm 
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Joined: Sun Sep 23, 2012 6:58 pm
Posts: 208
they are identical, the brackets may clarify, and are not harmful, but they are not necessary


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 Post subject: Re: help with algebra
PostPosted: Tue Feb 19, 2013 9:47 pm 
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Joined: Sat Jun 23, 2012 5:07 pm
Posts: 9
icw wrote:
Hi can anyone help with a simple problem, as I am not sure I am helping my dd correctly

2dr²p

Should the above be re-written as

2xdxrxrxp
or
2xdx(rxr)xp

or does it not matter?


They all the same and it doesn't really matter when you trying to answer the question, however, final answer should be written as
2dr²p, becasuse this form is more simplified than the other two.

Regards


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