Répondre :
y = 2x² + x - 6
a=2
b=1
c=-6
delta = b²-4 x a x c = 1-4x2x-6 = 49
racine de delta = 7
x1=-b-racine(delta)/2a = 1-7/4 = - 0,75
x2=-b+racine(delta)/2a = 1+7/4 = 2,75
a=2
b=1
c=-6
delta = b²-4 x a x c = 1-4x2x-6 = 49
racine de delta = 7
x1=-b-racine(delta)/2a = 1-7/4 = - 0,75
x2=-b+racine(delta)/2a = 1+7/4 = 2,75