Answers

2014-02-07T20:02:31+05:30
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! 
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2014-02-08T19:05:51+05:30
(y-2)^{2} =0^{2} 
so y-2=0
y=2
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