Question 835646
When {{{y=0}}}
{{{x^2-12+19=0}}}
 {{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
 {{{x = (-(12) +- sqrt( (-12)^2-4*1*19 ))/(2*1) }}} 
{{{x = (12 +- sqrt( (144-76 )))/(2) }}}
{{{x = (12 +- sqrt( 68))/(2*1) }}}
{{{x = (12 +- 2*sqrt( 17))/(2) }}}
{{{x = 12 +- 2*sqrt( 17)}}}