Question 44155
{{{2x^2 + 12x = -18}}}
{{{x^2 + 6x = -9}}}
{{{x^2 + 6x +9 = 0}}}
{{{(x+3)^2=0}}}
so x=-3

I hope this helps 
P.S. I am trying to start up my own homework help website. I would be extremely grateful if you would e-mail me some feedback on the help you received to adam.chapman@student.manchester.ac.uk