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= x² - 2x√3 + 3 - 2(x² - 3) + x² + 2x√3 + 3 =
= x² - 2x√3 + 3 - 2x² + 6 + x² + 2x√3 + 3 = 12
= x² - 2x*√3 + (√3)² - 2[x² -(√3)²] + x² + 2x*√3 + (√3)²=
= x² - 2x*√3 + 3 - 2[x² - 3 ] + x² + 2x*√3 + 3
= x² - 2x*√3 + 3 - 2x² + 6 + x² + 2x*√3 + 3 =
= 12