x = -b +- sqrt(b^2 -4*a*c)/2a
x = (-10 +- sqrt(10^2 -4*3*-5) )/6
x = (-10 +- sqrt (100 + 60) )/6
x = (-10 +- sqrt (160) )/6
x= (-10 +- 4sqrt10)/6
x = (-5 +- 2sqrt10)/3
x = (1 +- sqrt(1-4*2*6))/4
x= (1+-sqrt(1-48))/4
x = (1 +- sqrt(-47))/4
x = (1 +- i* sqrt(47))/4
x = (-2 +- sqrt(2^2-4*5*5))/10
x = (-2 +- sqrt(4-100))/10
x =(-2+- sqrt (-96))/10
x = (-2 +- 4i sqrt6))/10
x = (-1 +- 2i sqrt6))/5
