Matematika A - 2015. ljeto, 2.

$x^2-x+3=0x^\{2\}-x+3=0$

$x^2+x+3=0x^\{2\}+x+3=0$

$3x^2-3x+1=03\; x^\{2\}-3\; x+1=0$

$3x^2+3x+1=03\; x^\{2\}+3\; x+1=0$