Question 262300
step 1 - subtract 9 to get
{{{x^2 +16x +55 = 0}}}
step 2 - using quadratic, we get
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
which is
{{{x =(-16 +-sqrt(256 - 4*1*55))/2}}}
and then
{{{x = (-16 +-sqrt(36))/2}}}
which becomes
{{{x = (-16 +- 6)/2}}}
we get two answers:
x = -11
x = -5