Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

## #1 2005-09-17 21:42:17

tilly
Guest

### Rationalising denominators.

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

## #2 2005-09-17 23:01:07

MathsIsFun

Offline

### Re: Rationalising denominators.

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

tilly
Guest

## #4 2005-09-18 18:02:26

MathsIsFun

Offline

### Re: Rationalising denominators.

√ 2
------
3√ 3

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

tilly
Guest

cheers

## #6 2005-09-29 00:48:16

mathsyperson
Moderator

Offline

### Re: Rationalising denominators.

√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.

## #7 2005-10-07 02:32:27

ramzi
Novice

Offline

### Re: Rationalising denominators.

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

MathsIsFun