help with algebra
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help with algebra
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?
2dr²p
Should the above be re-written as
2xdxrxrxp
or
2xdx(rxr)xp
or does it not matter?
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- Posts: 208
- Joined: Sun Sep 23, 2012 7:58 pm
Re: help with algebra
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.
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.
Re: help with algebra
Thanks for the swift response
Re: help with algebra
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 ?
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 ?
-
- Posts: 208
- Joined: Sun Sep 23, 2012 7:58 pm
Re: help with algebra
they are identical, the brackets may clarify, and are not harmful, but they are not necessary
Re: help with algebra
They all the same and it doesn't really matter when you trying to answer the question, however, final answer should be written asicw 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?
2dr²p, becasuse this form is more simplified than the other two.
Regards