X^2+2x+q=0 D= 4-4q x1= (-2-2√(1-q))/2= -1-√(1-q) x2= (-2+2√(1-q))/2= -1+√(1-q) -1+√(1+q) - (-1-√(1-q))= 4 2√(1-q)= 4 √(1-q)= 2 1-q= 4 q=-3 x^2+2x-3=0 D= 4+12= 16= 4^2 x1= (-2-4)/2= -3 x2= (-2+4)/2= 1 Ответ: q=-3 ; x1=-3 ; x2=1 .