Question 355209
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
{{{x = (-5 +- sqrt( 5^2-4*1*(-6) ))/(2*1) }}} 
{{{x = (-5 +- sqrt( 25+24 ))/2 }}} 
{{{x = (-5 +- sqrt( 49 ))/2 }}} 
Take it from there and finish the calculation.