Question 263531
f(x)=x^2-2x-4 
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
x=(2+-sqrt[-2^2-4*1*-4])/2*1
x=(2+-sqrt[4+16])/2
x=(2+-sqrt20)/2
x=(2+-4.472)/2
x=(2+4.72)/2
x=6.72/2
x=3.36 ans.
x=(2-4.72)/2
x=-2.72/2
x=-1.36 ans.
{{{ graph( 300, 200, -6, 5, -10, 10, x^2 -2x -4) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, x^2 -2x -4).