Question 1013063
Use this {{{x = (-b +-sqrt( b^2-4*a*c ))/(2*a) }}}

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

{{{x = (-3 +- sqrt( 3^2-4*1*(-18) ))/(2*1) }}} 

{{{ x = (-3 +- sqrt(81))/3}}}

{{{x = (-3 +- 9)/3}}}

{{{x = (-1 +- 3)}}}

x = -1 + 3    or x = -1 -3

x =2 or x=-4