reset
set border
set xtics 1
# set ytics 1
set grid
set xzeroaxis lt 9 lw 2
set yzeroaxis lt 9 lw 2
set style line 1 lt -1 lw 3
set style line 2 lt 5 lw 3
set style line 3 lt 12 lw 3
set xrange [-7:7]
set yrange [-1000:1000]
# set samples 1000
# set key off
f(x)=x**5-45*x**3+324*x
#g(x)=x**2+32*x+260
#h(x)=-4+sqrt(x+16)
plot f(x) ls 1
# plot f(x) ls 1,g(x) ls 2, h(x) ls 3