Question

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Answer 1

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