Question

помогите с неравенствами

Answer 1

$displaystyle sqrt{x-1}<-4quad Leftrightarrow quad left { {{-4 geq 0} atop {x-1<16}} right. quad Rightarrow quad left { {{varnothing} atop {x<17}} right. quad Rightarrow quad varnothing$

$displaystyle sqrt{x-3}leq 0 quad Leftrightarrow quad left { {{x-3geq 0} atop {x-3leq 0}} right. quad Rightarrow quad left { {{xgeq 3} atop {xleq 3}} right. quad Rightarrowquad boxed{x=3}$