<prompt> Acha a na b ziwe mizizi ya x2 - 4x 5 0. Kokotoaa3 a4 b2 a2 b4 b3.  <response>: kwa fomula za Vieta, a b 4 na ab 5. Kishaanzaaligna3 b3 a ba2 - ab b2 a ba2 2ab b2 - 3ab a ba b2 - 3ab 4 cdoti 42 - 3 cdoti 5 4,mwishoalignnaanzaaligna4 b2 a2 b4 a2 b2 a2 b2 ab2 a b2 - 2ab 52 42 - 2 cdoti 5 150,mwishoalignhivyo a3 a4 b2 a2 b4 b3 154. 