Question

cat face 2 minus,2 radical din 2,pe langa 2 plus,2 radical din 2??

Answer 1

$(2 - 2 \sqrt{2})(2 + \sqrt{2}) = \\ \\ {2}^{2} - (2 \sqrt{2}) ^{2} = \\ \\ {2}^{2} - {2}^{2} \sqrt{2} ^{2} = \\ \\ 4 - 4 \sqrt{2} ^{2} = \\ \\ 4 - 4 \times 2 = \\ \\ 4 - 8 = - 4$

Answer 2

( 2 - 2√2 ) ( 2 + 2√2 ) = 2² - ( 2√2)² = 4 - 4 × 2 = 4 - 8 = - 4