Question 61146
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
{{{ x= (    -10+-sqrt(100+20))/2}}}   a=1,b=-10 c=-5 
{{{x=(-10+-sqrt120)/2}}}
{{{x=-5+-sqrt30}}}
this is your solution 
you have the correct answer
congrats!!!