set terminal png
set output "gnuplot05a.png"
	unset border
    set  nogrid
    set samples 100000
            set lmargin at screen 0
		set rmargin at screen 1
		set bmargin at screen 0
		set tmargin at screen 1
	set yrange [-15:-3]
	set xrange [-4:4]
	set size 5/5.
	set key center top reverse Left
	set xzeroaxis
	set yzeroaxis
	set xtics axis out scale 0.5
	set ytics axis
	plot(-x**2 +2*x -8) lt rgb "#FFAA00" lw 2 notitle