Question 329265
2x^2-2x-1=0
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
x=(2+-sqrt[-2^2-4*2*-1])/2*2
x=(2+-sqrt[4+8)/4
x=(2+-sqrt12)/4
x=(2+-3.4641)/4
x=5.4541/4
x=1.366 ans.
x=(2-3.4641)/4
x=-1.4641/4
x=-0.366 ans.