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OanaRoxana17id
[tex]E(x)= x^{2} + (x \sqrt{3}+1) ^{2} - (2x-1)^{2} - 2x( \sqrt{5} +2)[/tex][tex]E(x)= x^{2} +3 x^{2} +2 \sqrt{3} x + 1 - (4 x^{2} -4x+1) - 2 \sqrt{5} x - 4x [/tex][tex]E(x)= 4 x^{2} +2 \sqrt{3} x +1- 4 x^{2} +4x-1-2 \sqrt{5} x -4x \\ E(x)= 2 \sqrt{3}x - 2 \sqrt{5} x \\ E(x)= 2x( \sqrt{3} - \sqrt{5} )[/tex]

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