reset
set border
set xtics 1
#set ytics 20
set xzeroaxis lt 9 lw 2
set yzeroaxis lt 9 lw 2
set style line 1 lt -1 lw 2
set style line 2 lt -1 lw 1
set style line 3 lt 12 lw 3
set grid ls 2
set xrange [-11:11]
set yrange [-648000:648000]
# set samples 1000
set key off
f(x)=x**8-146*x**6+4969*x**4-37224*x**2+32400
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   
#(%i2) expand((x+10)*(x-10)*(x+6)*(x-6)*(x+3)*(x-3)*(x+1)*(x-1));
#		    8	     6	       4	  2
#(%o2) 		   x  - 146 x  + 4969 x  - 37224 x  + 32400