<PRE><B>Question 391383</B>
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I presume you mean:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ x^2\ -\ 4x\ -\ 21]


Which is a very attractive little quadratic trinomial.  Unfortunately, you didn&#39;t bother to actually ask a question, tell us what it is that you don&#39;t understand, or tell us what you have tried already.  Therefore, I&#39;m not going to help you.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
My calculator said it, I believe it, that settles it
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