Question

(х-1) ^{3} -(х+1) ^{3}≤ х-]6 x^{2}

Answer 1

$(x-1)^3-(x+1)^3 leq x-6x^2 \ x^3-3x^2+3x-1-x^3-3x^2-3x-1 leq x-6x^2 \ -6x^2-2leq x-6x^2 \-x leq 2 \ x geq -2$
или [-2;+∞)