Question 181523
{{{-5x^2-300=0}}}
{{{-5x^2=300}}}
{{{x^2=300/(-5)}}}
{{{x^2=-60}}}
{{{x=0 +- sqrt(60)i}}}
{{{x=0 +- 2*sqrt(15)i}}}
where 
{{{i=sqrt(-1)}}}