Question 211865
x squared - 4x - 13 = 0
x^2-4x-13=0
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
x=(4+-sqrt(-4^2-4*1*-13])/2*1
x=(4+-sqrt[16+52])/2
x=(4+-sqrt68)/2
x=(4+-8.2462)/2
x=12.2462/2
x=6.1231 ans.
x=(4-8.2462)/2
x=-4.2462/2
x=-2.1231 ans.