Now this problem will be giving i values since there's a negative in the square root. These i's are known as imaginary numbers. For the answer it should be these two:
x =(12-)/2=6-i = 6.0000-4.7958i
x =(12+)/2=6+i = 6.0000+4.7958i
Let me know if you need help with finding i and all or if you just needed the answer to check your work. Hope this helps!