pahelp po please !pakisagot po ng maayos ,salamat po

Answer:
r = 10i
i = imaginary number
Step-by-step explanation:
Transpose 100 to the other side and change signs
r2 = -100
Extract the square root of both sides, since it is the negative number, first find the square root of it.
r = 10
put i on it because it was a negative,
r = 10i
Step-by-step explanation: