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**tilly****Guest**

hey, i was wondering if you could show me how to rationalise the denomiators on a couple of these, in easy steps.

1

----

√ 2

√ 2

------

3√ 3

√ 43 - √ 23

-------------

√ 43 + √ 23

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,560

As in getting rid of radicals in the denominator?

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

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**tilly****Guest**

yes, please help

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,560

√ 2

------

3√ 3

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

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**tilly****Guest**

cheers

**mathsyperson****Moderator**- Registered: 2005-06-22
- Posts: 4,900

√43 - √23 √43 - √23 43 - 2√(43x23) + 23 66 - 2√989

------------- x ------------ = ------------------------ = -------------

√43 + √23 √43 - √23 43 - 23 20

The math tag looks rather complex.

Why did the vector cross the road?

It wanted to be normal.

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**ramzi****Member**- Registered: 2005-10-05
- Posts: 1

Clever maths people, how do you deduce (-1) x (-1)= 1

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**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,560

A baby taught us, see Multiplying Negatives

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

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