Ответ Автор - pavlickgitara13 1) х² - 2х - 5 = 0 Д= 4 + 20 = 24 х₁= (2 + √24)/2 = (2 + 2√6)/2 = 1+√6 х₂= (2- √24)/2= 1-√6(х₁+2)*(х₂+2) = (1+√6+2)*(1-√6+2)=3√6*(3-√6)=9√6 - 18 = 9 (√6-2)