I have to prove that if then identity is valid:

I have try to prove it.This what I have done:

So identity is not valid.

Am I right?

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- Jan 14th 2006, 03:01 PMDenMac21Identity proof
I have to prove that if then identity is valid:

I have try to prove it.This what I have done:

So identity is not valid.

Am I right? - Jan 14th 2006, 03:23 PMThePerfectHacker
Did you make a mistake when you multiplied the 3 terms by the 4 terms?

And I also do not understand what all that stuff in the beginning is? - Jan 14th 2006, 03:29 PMDenMac21Quote:

Originally Posted by**ThePerfectHacker**

Quote:

Originally Posted by**ThePerfectHacker**

- Jan 14th 2006, 03:39 PMThePerfectHacker
I also checked, confirmed.

That means that if the identity is true then which means that if is anything else from 1 then it is false. Which means it cannot be an identity. - Jan 14th 2006, 04:47 PMticbolQuote:

Originally Posted by**DenMac21**

Try x=0 and y=2.

You get the LHS to be 13/4, while the RHS to be 7/2.

LHS <> RHS, hence, not an identity.

So no need to crack cranium for those x's and y's. - Jan 15th 2006, 12:13 AMCaptainBlackQuote:

Originally Posted by**ThePerfectHacker**

RonL