how would I write 4/√7 with a fraction whose denominator is even?

Thanks

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- Jul 25th 2011, 12:33 PMdrewmRadical fraction
how would I write 4/√7 with a fraction whose denominator is even?

Thanks - Jul 25th 2011, 12:40 PMPlatoRe: Radical fraction
- Jul 25th 2011, 12:57 PMdrewmRe: Radical fraction
ok thanks, but can you tell me how you got that?

- Jul 25th 2011, 01:01 PMPlatoRe: Radical fraction
- Jul 25th 2011, 01:04 PMe^(i*pi)Re: Radical fraction
If you think about it another way - you need to multiply top and bottom by to rationalise the denominator. However, 7 is not an even number so you must multiply top and bottom by since multiplying any integer by 2 gives an even number.

Plato did the same thing but combined the steps - Jul 25th 2011, 06:52 PMtheloserRe: Radical fraction

Like they said add 2 in front of the radical, there you would multiply .