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x² - y² + 2.x.y = (x + y) (x - y) + 2xy
= [(2 - √3 + 2 + √3) (2 - √3 - (2 + √3)] + 2 (2 - √3) (2 + √3)
= 4 (2 - √3 - 2 - √3) + 2 (4 - 3)
= 4 .(- 2√3) + 2 . 1
= - 8√3 + 2 atau ...
= 2 - 8√3