Question 1104098
{{{ax^2+bx+c=0}}}

Discriminant is  {{{b^2-4ac}}}.
<pre>
SIGN of Discriminant   SOLUTIONS
Negative                 0
Zero                     1
Positive                 2
</pre>


{{{3x^2+3x=21}}}
{{{3x^2+3x-21=0}}}
-
{{{system(a=3,b=3,c=-21)}}}


Make the substitutions, evaluate, and decide.