1. -12i
Step-by-step explanation:
The square root of 144 is 12 as 12 times itself is 144 now bi is the opposite of -bi therefore that positive 12 becomes negative and you add the i.
2. -2
Explanation:
2 squared is 4 therefore the square root of 4 is 2 then add the negative
Hope that helps! Have a good day :)