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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,414

I repeated it because of this:

But when 9 is in a square root sign it gives two answers i.e -3 and 3.

I wanted him to be sure that the answer is only 3. 1 answer not 2.

**In mathematics, you don't understand things. You just get used to them.I have the result, but I do not yet know how to get it.All physicists, and a good many quite respectable mathematicians are contemptuous about proof.**

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**EbenezerSon****Member**- Registered: 2013-07-04
- Posts: 230

Hi, bobym.

Look the link you provided at page 4 concerning the square roots signs.

It says so:

When two numbers are multiplied within a square root, you can split it into a multiplication of two square roots.

But only when X and Y are both greater than or equal to 0.

My question is:

Which figure is equal to zero before the splitting will be possible?

*Last edited by EbenezerSon (2013-11-17 20:35:26)*

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,414

Hi;

I do not see the figure.

**In mathematics, you don't understand things. You just get used to them.I have the result, but I do not yet know how to get it.All physicists, and a good many quite respectable mathematicians are contemptuous about proof.**

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