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  1. P

    Solve the equation and Find y

    You can have a look at this page,http://en.wikipedia.org/wiki/Quartic_equation" [Broken] Or using Mathematica,you can get four roots.
  2. P

    Show matrix is invertible. THanks

    No,invertible matrix should be a n×n matrix,you must have lost a row(x1,x2,x3,…xn)T,then it's a van de Monde matrix
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