x^2 + 11x - 26 = 0;
D = 11^2 - 4*1* (-26) = 225 = 15^2
x 1= (-11 - 15)/ 2 = -13
x2 = (-11 + 15)/2 = 2
ответ: x = -13 и 2
x^2 + 11x - 26 = 0;
D = 11^2 - 4*1* (-26) = 225 = 15^2
x 1= (-11 - 15)/ 2 = -13
x2 = (-11 + 15)/2 = 2
ответ: x = -13 и 2
х1=(11-15)/2=-2
х2=11+15)/2=13
ответ: -2 и 13