Find all the values of z: (hìnt: use tvalues of the discrirninant) 28 + 423 +8 = 0 O -1.366-j0.366ó O 1-j O 0.366-j1.366 O 0.366+j1.36ó O -1-j D-1+j O-1.366+j0.366 1+j

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