F(x)=x^3-x^2-5x+16
f1(x)=3x^2-2x-5=0. D=4+4*5*3=4+60=64=8^2.
x1=(2+8)/6=10/36=5/3=1 2/3. x2=(2-8)/6=-1
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F(x)=x^3-x^2-5x+16
f1(x)=3x^2-2x-5=0. D=4+4*5*3=4+60=64=8^2.
x1=(2+8)/6=10/36=5/3=1 2/3. x2=(2-8)/6=-1