(1)x²-2√2x+2＝0
→x²-2√2x+(√2)²＝0
→(x-√2)＝0
∴x＝√2.
(2)(y-3)²＝2y(y-4)+10
→y²-6y+9＝2y²-4y+10
→y²+2y+1＝0
→(y+1)²＝0
∴y＝-1.