Question 1010266
Better if you are permitted to....
{{{(-4)((-1/4)x^2-(6/4)x-1)=-4*0}}}


{{{x^2+6x+4=0}}}
Completing the square for this is now simpler.
The term to use is  {{{(6/2)^2=3^2=9}}}.


{{{x^2+6x+9+4-9=0}}}


{{{(x+3)^2-5=0}}}----------and just solve for x from this form.