Question 254294
{{{m = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 

{{{m=(-12 +- sqrt(144-(4*1*5)))/2}}}
{{{m=-6 +- sqrt(144-20)/2}}}
{{{m=-6 +- sqrt(124)/2}}}
{{{m=-6 +- sqrt(124)/2}}}
{{{m=-6 +- sqrt(31)}}}

USing the solver: *[invoke quadratic "x", 1, 12, 5]