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Verified answer

В) (x + 12)(3 - x) > 0
(x + 12)( x - 3) < 0
    +             -                +
_____₀________₀__________
         - 12            3
x ∈ (- 12 ; 3)
г) (6 + x)(3x - 1) ≤ 0
3(x + 6)(x - 1/3) ≤ 0
(x + 6)(x - 1/3) ≤ 0
       +                 -                  +
___________________________
               - 6                 1/3
x ∈ [- 6 ; 1/3]