Răspuns:
^-la puterea a ...
/- fractie
1. a)x^2-3x+2=0
delta =(3^2)-4×1×2=9-8=1
radical din delta = 1
x1= (-3)+1/2=-2/2=1
x2=(-3)-1/2=-4/2=-2
b)x^2+x-2=0
delta=(1^2)-4×1×(-2)=9
radical din delta =3
x1=-1+3/2=2/2=1
x2=-1-3/2=-4/2=2
d)2x^2+x-1=0
delta=(1^2)-4×2×(-1)=9
radical din delta=3
x1=-1+3/2×2=2/4
x2=-1-3/2×2=-4/4=-1
e)3x^2+4x+1=0
delta=(4^2)-4×3×1=16-12=4
radical din delta=2
x1=-4+2/2×3=-2/6
x2=-4-2/2×3=-6/6=-1
