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Find the value of k that will make x-2
a factor of x4-3x3+4x2+2x+k
Use synthetic division
     __________________
  2 | 1  -3   4   2   k
    |     2  -2   4  12  
      1  -1   2   6  k+12
Set the remainder k+12 equal to zero 
and solve for k
   k + 12 = 0
        x = -12
Edwin