х²-4х < 0
x(x-4) < 0
x=0 x=4
+ - +
_____0________4_________
x∈ (0;4)
х²-х-6 ≥ 0
(х-3)(х+2) ≥ 0
х=3 х= -2
____-2__________3_________
х∈ (-∞; -2]∪[3;+∞)
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х²-4х < 0
x(x-4) < 0
x=0 x=4
+ - +
_____0________4_________
x∈ (0;4)
х²-х-6 ≥ 0
(х-3)(х+2) ≥ 0
х=3 х= -2
+ - +
____-2__________3_________
х∈ (-∞; -2]∪[3;+∞)