Question 475438
{{{x(x-3)=x-9}}} open brackets
{{{x^2-3x=x-9}}}
{{{x^2-3x-x+9=0}}}
{{{x^2-4x+9=0}}}
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
{{{x = (-(-4)+- sqrt((-4)^2-4*1*9 ))/(2*1) }}} 
{{{x = (4+- i*sqrt(20))/2 }}} 
{{{x = (4+- 2i*sqrt(5))/2 }}} 
{{{x = 2+- i*sqrt(5)) }}}