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enter image description here

I have no idea where to start this question.

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    $\begingroup$ Often, the starting point for proving "no such things with properties ... exists" is assuming that it does and proving that it leads to a contradiction. $\endgroup$ – taninamdar Sep 15 '15 at 3:02
  • $\begingroup$ I hope you are familiar with the use of MathJax and $\LaTeX$ on this site. A brief introduction links to the more detailed home-grown tutorial. Just posting the image of an assignment with asservation "I have no idea.." may give your Readers the impression you have limited interest in solving the problem yourself. $\endgroup$ – hardmath Sep 15 '15 at 3:05
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Hint: Supposing that such an order exists, try to decide whether $i < 0$ or $i > 0$.

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