A) $ y=6 $
B) $ y=5 $
C) $ y=\sqrt{6} $
D) $ y=\sqrt{5} $
Correct Answer: D
$ \Rightarrow (y-2)(y+2)=1\Rightarrow y^{2}-4=1\Rightarrow y^{2}=5 $
$ \therefore y=\pm \sqrt{5}sincey>0\therefore y=\sqrt{5} $
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