Question 196863
{{{x^2+11x+121/4)-121/4+21/4=0}}}
:
{{{(x+11/2)^2-25=0}}}--->{{{(x+11/2)^2=25}}}

:
x+11/2=5 and x+11/2=-5
:
x=-1/2 and x=-21/2