Question

deschidem paranteza 2 minus radical din 2 inchidem paranteza la 2 plus 2 radical din 2 pe langa 2 minus radical din 2 inchidem paranteza plus 2

Answer 1

(2-√2)²+2√2(2-√2)+2=
4-4√2+2+4√2-4+2=
2+2=4

Answer 2

$(2-\sqrt{2} )^2+2\sqrt{2} (2-\sqrt{2}) =(2-\sqrt{2})(2-\sqrt{2}+2\sqrt{2} )=(2-\sqrt{2})(2-\sqrt{2} )=(2-\sqrt{2})^2 =4-4\sqrt{2}+2=6-2\sqrt{2}$