# Where is the mistake in this epsilon delta proof?

Missing template due to originally being posted in different forum.
The question asks to proof that the limit given in incorrect by contradiction. I tried working using the estimation method and the weird thing is that I completed the proof and found that the supposedly "incorrect" limit gave a correct answer although it was supposed to give me a contradiction of some sort, can someone help?

How can I have reached an N when the limit is incorrect?! Any help would be appreciated.
Also, sorry for my bad English.

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Orodruin
Staff Emeritus
Homework Helper
Gold Member
You do realise that ##-4\sqrt{n+3}## is negative and therefore always smaller than ##M##? There are several such mistakes.

You do realise that ##-4\sqrt{n+3}## is negative and therefore always smaller than ##M##? There are several such mistakes.
Ohh wow! Its 3 AM here so I do apologize for this.

Also, sorry for posting in the wrong forum.
Cheers :)

Fredrik
Staff Emeritus