(y+√2)²—4√2×y=0

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(y+√2)²—4√2×y=0
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(y+√2)²—4√2×y=0
(y+√2)²—4√2×y=0

(y+√2)²—4√2×y=0
y²+2√2y+2-4√2y=0
y²-2√2y+2=0
(y-√2)²=0
y=√2