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[tex](2x-1)^2-(x- \sqrt2)(x+ \sqrt2)[/tex]

Răspuns :

[tex](2x-1)^2-(x- \sqrt{2} )(x+ \sqrt{2} )=(2x)^2-2 \cdot 2x \cdot 1+1^2-x^2+2= \\ =4x^2-4x+1-x^2+2=3x^2-4x+3[/tex]