Question 228585
You are correct about the second problem.


For the first one, add +4 to each side:
3Z^2 =-108


Divide both sides by 3:

z^2 = -36


Are you allowed to use complex numbers?


If NOT, then there are no real solutions.  


If SO, then {{{z= 0+-sqrt(-36) }}}
{{{z=0+-6i}}}


Dr. Robert J. Rapalje, Retired
Seminole State College
Altamonte Springs Campus