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(y-2)2+(y+4)2=8
We move all terms to the left:
(y-2)2+(y+4)2-(8)=0
We multiply parentheses
2y+2y-4+8-8=0
We add all the numbers together, and all the variables
4y-4=0
We move all terms containing y to the left, all other terms to the right
4y=4
y=4/4
y=1
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