Question 869811
{{{2x^2+4x=-1}}}
{{{2(x^2+2x+1)=-1+2}}}
{{{2(x+1)^2=1}}}
{{{(x+1)^2=1/2}}}
{{{x+1=0 +- sqrt(2)/2}}}
{{{x=-1 +- sqrt(2)/2}}}