reset set border set xtics 1 # set ytics 100 set ytics 500 set xzeroaxis lt 9 lw 5 set yzeroaxis lt 9 lw 5 set style line 1 lt 1 lw 4 set style line 2 lt 3 lw 5 set style line 3 lt 10 lw 6 set style line 4 lt 12 lw 3 set style line 5 lt 9 lw 1 set grid ls 5 show grid # ranges for f(x), g(x), h(x) # set xrange [-12:9] # set yrange [-250:430] set xrange [-7:7] set yrange [-2500:1400] set samples 1000 set key on # f(x)=x**4-8*x**2+16 # g(x)=x**3+3*x**2-88*x # h(x)=x**3-4*x**2-17*x+60 i(x)=x**5-45*x**3+324*x j(x)=-x**6+14*x**4-49*x**2+36 k(x)=x**6-54*x**4+825*x**2-2500 # plot f(x) ls 1 # plot f(x) ls 1,g(x) ls 2, h(x) ls 3 plot i(x) ls 1,j(x) ls 2, k(x) ls 3