Question 255366
Your original equation was:
{{{(x*-3x)+8=0}}}
suppose * = 2. then we have a quadratic of the form
{{{(x2-3x)+8=0}}}
which can easily be solved using the quadratic formula as
{{{x = (3 +- sqrt( 9-4*1*8 ))/(2*1) }}}
which is simplified as
{{{x = (3 +- sqrt(-23))/2 }}}
From here you have one of two ways to go.
 (1) if you have never been shown imaginary numbers, then say no solution.
(2) If you have been shown imaginary numbers, then say 
{{{(3 + isqrt(23))/2}}} , {{{(3 - isqrt(23))/2}}}