Question

find the value of Y:
(Y-2)² =0

Answer 1

In this kind of equation you can just skip the square as it changes nothing here. It means that we can solve it like this: 

$(y-2)^2=0 \\ y-2=0\\y=2$

Ok, let's check if it adds up now: 

$y=2 \\ (2-2)^2=0 \\ 4-4=0 \\ 0=0$

Cheers! 

Answer 2

(y-2)^{2} =0^{2} 
so y-2=0
y=2