You can put this solution on YOUR website! First of all, are you allowed to have complex (imaginary!) solutions for this equation? If you are restricted to the real numbers, then there is NO SOLUTION, since a real number squared will never equal a negative.
However, if imaginary numbers are allowed, then
Since 15^2=225, or
Dr. Robert J. Rapalje, Retired
Seminole State College of Florida
Altamonte Springs Campus