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-2x-6 ≥ 0 i x+5≠0
-2x≥ 6 i x≠-5
x ≤-3
D=(-∞,-5) u (-5,-3>
b)
x²-4x≥ 0 i x≠0
x(x-4)≥0
x∈(-∞,0> u <4, +∞) ∧ x≠0
D=(-∞, 0) u <4, +∞)
c)
2x+3>0
2x > -3
x> -3/2
D=(-1,5 , +∞)
d)
x²-1 >0
(x+1)(x-1) > 0
D=(-∞, -1) u (1, +∞)