Question 486051
<pre>
{{{x^2+4x+8=0}}}

Compare to

{{{ax^2+bx+c=0}}}

{{{a=1}}}, {{{b=4}}}, {{{c=8}}}

{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 

{{{x = (-(4) +- sqrt( (4)^2-4*(1)*(8) ))/(2*(1)) }}} 

{{{x = (-4 +- sqrt(16-32 ))/2 }}}

{{{x = (-4 +- sqrt(-16 ))/2 }}}

{{{x = (-4 +- i*sqrt(16 ))/2 }}}

{{{x = (-4 +- i*4)/2 }}}

{{{x = (-4 +- 4i)/2 }}}

{{{x = (-4)/2 +- (4i)/2 }}}

{{{x = -2 +- 2i }}}

Two conjugate imaginary solutions:  -2 + 2i and -2 - 2i
 
Edwin</pre>