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Last maths help i promise

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AnthonyB 23 Oct 2006
ok bare with me

an even number is written as 2xN
an odd number is written as 2xN+1

So to times an odd and an even number and i right in think the equation will be?

(2xN)x ((2xn)+1)

then how would i compress that?

Thanks
 Mowglee 23 Oct 2006
In reply to AnthonyB: 4n^2 + 2n
Looneybin 23 Oct 2006
In reply to AnthonyB: i think... (2N)(2N+1)
johnsdowens 23 Oct 2006
In reply to AnthonyB:
> ok bare with me

> (2xN)x ((2xn)+1)
>
> then how would i compress that?

multiply both parts of the bracket by what is outside:

2N(2N+1) = 2Nx2N + 1x2N
= 4N^2 + 2N

 whiting.jp 23 Oct 2006
In reply to AnthonyB:
> ok bare with me
>
> an even number is written as 2xN
> an odd number is written as 2xN+1
>
> So to times an odd and an even number and i right in think the equation will be?
>
> (2xN)x ((2xn)+1)

It might be worth noting that if you're trying to work something out for *any* even and *any* odd number then that equation isn't useful. You'd have to use:

even is 2xN
odd is 2xP+1

as is you're only dealing with adjacent even and odd numbers
AnthonyB 23 Oct 2006

Yes im dealing with consecutive numbers.

4N^2 + 2N

does ^2 mean 4N(squared)?
johnsdowens 23 Oct 2006
In reply to AnthonyB:
>
> Yes im dealing with consecutive numbers.
>
> 4N^2 + 2N
>
> does ^2 mean 4N(squared)?

4x(N sqaured)
AnthonyB 23 Oct 2006


can (2xN)xM be rearranged as 2x(NxM)?
Robert Dickson 23 Oct 2006
In reply to AnthonyB: yes
johnsdowens 23 Oct 2006
In reply to AnthonyB:
>
>
> can (2xN)xM be rearranged as 2x(NxM)?

try it and see. (2*5)*10 = ? | 2* (5*10) = ?

johnsdowens 23 Oct 2006
In reply to johnsdowens:

you can add or multiply single terms in any order you want. (The same thing doesn't work with divide or subract though)
AnthonyB 23 Oct 2006
In reply to johnsdowens:

Yep got that thanks

So i have the equation 2 x (N x M) what would be the inverse calcultaion would it be (a = answer)

(a/2)/(N/M)

?

AnthonyB 23 Oct 2006
In reply to AnthonyB:

Sorry bump
 TRNovice 23 Oct 2006
In reply to AnthonyB:
> ok bare with me
>

That's soliciting and probably illegal BTW?
johnsdowens 23 Oct 2006
In reply to AnthonyB:
> (In reply to johnsdowens)
>
> Yep got that thanks
>
> So i have the equation 2 x (N x M) what would be the inverse calcultaion would it be (a = answer)
>
> (a/2)/(N/M)
>
> ?

firstly, remove the unneccesary brackets: a = 2xNxM

What do you want to invert to solve? N = a/(2xM) ; M = a/(2xN) ; 2 = a/(NxM) ; 1 = a/(2xMxM)

in the first example, N = a/(2xM), this is the same as doing N = a/2/M
 TN 23 Oct 2006
In reply to johnsdowens:

I remember being taught BODMAS as the order for dealing with calculations:
Brackets
O???
Divide
Multiply
Add
Subtract

Except I can't remember what the O is or even what it could be... I suspect if I got an equation with the 'O' involved I would probably deal with it correctly without noticing.
johnsdowens 23 Oct 2006
In reply to TN:

BODMAS - Brackets Off, Div, Mult, Add, Sub

I think the "brackets off" was a fiddle to make it memorable. basically, do whatever is in the brackets first to reduce the equation to single terms.

When simplifying or rearrangin equations though, you should aim to only have as many brackets as you need - unneccessary ones like 2x(MxN) can lead to confusion.
 TN 23 Oct 2006
In reply to johnsdowens:

Ah, that explains why I couldn't remember what purpose the O served!

I loved maths. I still do, actually.
In reply to TN:
> (In reply to johnsdowens)
>
> I remember being taught BODMAS as the order for dealing with calculations:
> Brackets
> O???
> Divide
> Multiply
> Add
> Subtract
>
> Except I can't remember what the O is or even what it could be... I suspect if I got an equation with the 'O' involved I would probably deal with it correctly without noticing.

The O stood for "Of" as in to the power of, also "order" - same thing
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