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How many roots? (Posted on 2011-07-31) Difficulty: 3 of 5
Prove that the equation
x^4-4*x-1=0
has at most 2 real number solutions.

No Solution Yet Submitted by Ady TZIDON    
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re: answer Comment 6 of 6 |
(In reply to by )

Here is a quick thought: dealing with unknown phone calls can be annoying, right?  I think we all can agree with that!  Yet knowing reverse cell phone lookup directory is available to quickly obtain the name and address associated with those calls is a major comfort to many people.  
  Posted by Joan Smith on 2012-02-19 12:02:16

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