Please Explain...

ZHero · 2010-04-04 22:42:59

Last edited by ZHero (2010-04-05 19:31:17)

JaneFairfax · 2010-04-05 02:22:35

soroban · 2010-04-05 04:03:09

.

ZHero · 2010-04-05 05:37:58

JaneFairfax wrote:

ZHero wrote:

Jane, can u tell me what does this N=-2 signify?? :

Last edited by ZHero (2010-04-05 05:44:09)

ZHero · 2010-04-05 05:49:25

soroban wrote:

NICE!!

Avon · 2010-04-05 16:47:56

ZHero,

You haven't really shown that (N+2)^2 = 0, only that (N+2)^2 is divisible by 9.
Hence N must be one of 1,4,7 and you'll have to do something else to decide which.

ZHero · 2010-04-05 19:37:34

Avon wrote:

ZHero,
You haven't really shown that (N+2)^2 = 0, ...

I just did my calculation above and got (N+2)^2=0.
I mean, I don't Want to Show that (N+2)^2=0.
I just want to know what information does (N+2)^2=0 hold??

Avon · 2010-04-05 23:43:28

When you replace numbers by their digit sums and cast out nines you are essentially considering two numbers to be the same if they have the same remainder when divided by 9.

I would write rather that when I am doing this. Hence we have

We cannot now deduce that

since 0 has three square roots modulo 9. These are 0, 3 and 6 so we have

and since I'm biased against negative numbers

ZHero · 2010-04-06 00:37:33

hi A1

Wonderful Explanation!!

Now i got it...

Thx a Lot!

Last edited by ZHero (2010-04-06 02:29:13)

Math Is Fun Forum

#1 2010-04-04 22:42:59

Please Explain...

#2 2010-04-05 02:22:35

Re: Please Explain...

#3 2010-04-05 04:03:09

Re: Please Explain...

#4 2010-04-05 05:37:58

Re: Please Explain...

#5 2010-04-05 05:49:25

Re: Please Explain...

#6 2010-04-05 16:47:56

Re: Please Explain...

#7 2010-04-05 19:37:34

Re: Please Explain...

#8 2010-04-05 23:43:28

Re: Please Explain...

#9 2010-04-06 00:37:33

Re: Please Explain...

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