2x²+x-1=0
a=2; b=1; c= -1
D=b²-4ac=1²-4*2*(-1)=1+8=9
x_{1}=(-b-√D)/(2a)=(-1-√9)/(2*2)=(-1-3)/4=-4/4= -1
x_{2}=(-b+√D)/(2a)=(-1+3)/4=2/4=1/2=0,5
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2x²+x-1=0
a=2; b=1; c= -1
D=b²-4ac=1²-4*2*(-1)=1+8=9
x_{1}=(-b-√D)/(2a)=(-1-√9)/(2*2)=(-1-3)/4=-4/4= -1
x_{2}=(-b+√D)/(2a)=(-1+3)/4=2/4=1/2=0,5