Regent1828

Verified answer

X(x + 1) = 255
x² + x - 255 = 0        D = b²-4ac = 1+4*255 = 1021

x₁ = (-b+√D)/2a = (-1+√1021)/2
x₂ = (-b -√D)/2a = (-1-√1021)/2

Ответ: {(-1+√1021)/2; (-1-√1021)/2}