Factoring??

[CyberCarsten]

I'm reading a tutorial about quadratic equations, and I met a word I didn't understad (I'm from Denmark...)

The word is factoring, and is a part of the following sentence:

The simplest way of solving an equation involving x2 is by factoring . Recall that zero has an exceptional property:

[Good Dreams]

Putting a factor in evidence:

2x^2+6x=0 <=>
<=> 2x*(x+3) = 0
<=> x=0 Or x=-3

[CyberCarsten]

What is that, and what does the word factoring mean??

[Good Dreams]

Within a multiplication x * 4 *y we have x factor, 4 factor and the y factor. But 4 * x can be a factor as well.

Factoring is to put in evidence a factor as I did in he last post ( the 2*x factor)

[CyberCarsten]

Ok, but why did you get this <=> 2x*(x+3) = 0 on the second line??

[Good Dreams]

2x*(x+3) = 0
<=> 2x*x + 2x*3
<=> 2x^2 + 6x

I think this is called distributing (it's the inverse of factoring I suppose)

[CyberCarsten]

I'm sorry if I'm a little slow, but where did the number 3 come from??? 6/2 ??

[Good Dreams]

Originally posted by CyberCarsten
6/2 ??

Yes

This is a simple example. Don't underestimate yourself, I'm quite slow in programming. I still use a VB 2.0 help file

[CyberCarsten]

That was pretty old! I have a VB5 help file if you want it!
Thanks for the math lessons!

[Good Dreams]

How big is it? (zipped)
If you have the patience to do it can you e-mail it to me?

[email protected]

I would be very greatfull

[CyberCarsten]

It's about 1.19 Mb Zipped. Is that ok??

[Good Dreams]

It's fine for me. It has the same size as 2.0 version but send it then. Thank you.

[CyberCarsten]

I just tried mailing it to you but I got a storage error:

This is the Postfix program at host cicero0.cybercity.dk.

I'm sorry to have to inform you that the message returned
below could not be delivered to one or more destinations.

For further assistance, please contact <[email protected]>

If you do so, please include this problem report. You can
delete your own text from the message returned below.

The Postfix program

<[email protected]>: host mc6.law13.hotmail.com[64.4.50.71] said: 552
Requested mail action aborted: exceeded storage allocation

[Good Dreams]

Ok, I liked to stick with my 69th post, but what a heck, I need to reply.

Try this address instead. Of course my mother will kill me, but it's ok:

[email protected]

[DavidHooper]

can you send it to me or give me a url?:
[email protected]

thanks, everyone's really helpful!