Add  to both sides:



Divide through by coefficient of  which is 3



To the side, multiply the coefficient of ,
which is  by , getting * 

Square .  . Add  to both
sides



Factor the left side. Get  on the right:



Write left side as a perfect square:
Conbine fractions on the right:



Use the principle of square roots:

=±

=±

Add  to both sides:


 
So the two solutions are

 and 

Or if you prefer you can write them over their
common denominator:

 and 

Edwin