Question 311056
{{{x^2+3x-18=(x+6)(x-3)}}}
{{{highlight(x=-6)}}} and {{{highlight(x=3)}}}
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{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
{{{x = (-3 +- sqrt( 3^2-4*1*(-18) ))/(2*1) }}} 
{{{x = (-3 +- sqrt( 9+72 ))/2 }}} 
{{{x = (-3 +- sqrt( 81 ))/2 }}} 
{{{x = (-3 +- 9)/2 }}}
{{{x1=(-3+9)/2=6/2=3}}}
{{{highlight(x1=3)}}}
{{{x2=(-3-9)/2=-12/2}}} 
{{{highlight( x2=-6)}}}