Question 227287
f(x)= x^2-2x-1 
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
x=(2+-sqrt[-2^2-4*1*-1])/2*1
x=(2+-sqrt[4+4)/2
x=(2+-sqrt8)/2
x=(2+-2.828)2
x=2+2.828)/2
x=4.828/2
x=2.414 ans.
x=(2-2.828)/2
x=-.828/2
x=-.414 ans.