Question 861666
{{{-2x^2-3x-5=0}}}
{{{-2(x^2+(3/2)x)=5}}}
{{{-2(x^2+(3/2)x+9/16)=5-2(9/16)}}}
{{{-2(x+(3/4))^2=80/16-18/16}}}
{{{-2(x+(3/4))^2=62/16}}}
{{{(x+(3/4))^2=-31/16}}}
{{{x+(3/4)=0 +- (sqrt(31)/4)i}}}
{{{x=-3/4 +- (sqrt(31)/4)i}}}
{{{x=(-3 +- (sqrt(31))i)/4}}}