х-1)(х+4)≥0
(х-1)(х+4)=0
x-1=0
x=1
x+4=0
x=-4
x∈(-∞;-4]U[1;∞)
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х-1)(х+4)≥0
(х-1)(х+4)=0
x-1=0
x=1
x+4=0
x=-4
x∈(-∞;-4]U[1;∞)