reset
set border
set xtics 1
set grid
set xzeroaxis lt 9 lw 3
set yzeroaxis lt 9 lw 3
set style line 1 lt -1 lw 4
set style line 2 lt 5 lw 3
set style line 3 lt 12 lw 3
set xrange [-5.5:5.5]
f(x)=x**2
g(x)=(x-5)**2
h(x)=(x-3)**2
j(x)=f(x)*g(x)*h(x)
plot j(x) ls 1