2х(х+3)(7-х) меньше или равно 0

2x(x + 3)(7 - x) ≤ 0- 2x(x + 3)(x - 7) ≤ 0x(x + 3)(x - 7) ≥ 0       -                 +                 -                    +_____________________________________               - 3               0                    7                //////////////////                      /////////////////////x ∈ [- 3 ; 0] ∪ [7 ; + ∞)