2x^(3)-36x-15x^(2)+49 ≥ 0,
2x^(3)-15x^(2)-36x+49 ≥ 0,
2x^(3)-2x^(2)-13x^(2)+13x-49x+49 ≥ 0,
2x^(2)(x-1)-13x(x-1)-49(x-1) ≥ 0,
(x-1)(2x^(2)-13x-49) ≥ 0,
x-1=0, x=1;
2x^(2)-13x-49=0,
D=169+392=561=(sqrt(561))^(2),
x=(13 ± sqrt(561))/4,
___-____[(13-sqrt(561))/4]_____+____[1]____-_____[(13+sqrt(561))/4]____+____
x ∈ [(13-sqrt(561))/4; 1] ∪ [(13+sqrt(561))/4;+ ∞).