<prompt> Tafuta mizizi halisi yax4 - 2x3 - x 2 0.  <response>: Tunaweza kuainisha polynomial kamaanzaalignx4 - 2x3 - x 2 x - 2 x3 - x - 2 x - 2x3 - 1 x - 2x - 1x2 x 1.endalignKipengele cha quadratic x2 x 1 hakina mizizi halisi, kwa hivyo mizizi halisi ni 1,2. 