Решить неравенство [latex] sqrt{1-4x} geq 2x+1[/latex] пожлуйста быстреееее((((

[latex] sqrt{1-4x} geq 2x+1, \ left [ {{ left { {{2x+1 extless 0,} atop {1-4x geq 0,}} ight. } atop { left { {{2x+1 geq 0,} atop {1-4x geq (2x+1)^2}} ight. }} ight. left [ {{ left { {{2x extless -1,} atop {-4x geq -1,}} ight. } atop { left { {{2x geq -1,} atop {1-4x geq 4x^2+4x+1,}} ight. }} ight. left [ {{ left { {{x extless -0,5,} atop {x leq 0,25,}} ight. } atop { left { {{x geq -0,5,} atop {4x^2+8x leq 0,}} ight. }} ight. left [ {{ x<-0,5, } atop { left { {{x geq -0,5,} atop {x(x+2) leq 0,}} ight. }} ight. left [ {{ x<-0,5, } atop { left { {{x geq -0,5,} atop {-2 leq x leq 0,}} ight. }} ight. [/latex][latex] left [ {{ x extless -0,5, } atop { -0,5 leq x leq 0, }} ight. \ x leq 0, \ xin(-infty;0].[/latex]