[tex](y-1)^{2}=4[/tex]
(y-1)²=4 ⇒у-1=√4
y-1=2 ⇒ у=3
у-1=-2 ⇒ у=-1
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(y-1)²=4 ⇒у-1=√4
y-1=2 ⇒ у=3
у-1=-2 ⇒ у=-1