3x(x^2+1)>/ 3x -39 cрочно

Question

3x(x^2+1)>/ 3x -39 cрочно

Answer 1

3x^3 + 3x -3x + 39 >= 0
3x^3 + 39 >= 0
x^3 + 13 >= 0
x^3 >= - 13
x >= (-13)^(1/3)