Вичислите дискриминант квадратного трехчена:

а) 2х²+5х+3;

б) 2х²-5х+3;

в)  2х²+5х-3;

г) 2х²-5х-3;

д) х²-4х+5;

е) х²+6х+9;

ж) х²+2х+1;

з) -3х²+5х-2; 

и) х²+2х+2; 

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