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Cách `1:`

`x^2-2\sqrt{2}x+2`

`=x^2-\sqrt{2}x-\sqrt{2}x+2`

`=x.(x-\sqrt{2})-\sqrt{2}.(x-\sqrt{2})`

`=(x-\sqrt{2}).(x-\sqrt{2})`

Cách `2:`

`x^2-2\sqrt{2}x+2`

`=x^2-2\sqrt{2}x+\sqrt{2}^2`

`=(x-\sqrt{2})^2`

`=(x-\sqrt{2}).(x-\sqrt{2})`