Question

Aratati ca: (2+√3)^2 + (1-2√3)^2 = 20

Answer 1

$(2+ \sqrt{3})^{2} + (1- 2\sqrt{3})^{2} = 4 + 4 \sqrt{3} + 3 + 1 - 4\sqrt{3} + 12 = 4 + 3 + 1 + 12 = 8 + 12 = 20$