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//example(3.17)
c=[51200 0 -39712 0 7392 0 -170 0 1 ]
p8=poly(c,'x','coeff')
roots(p8)
xset('window',0);
x=-11:01:11; // defining the range of x.
deff('[y]=f(x)','y=x^8-170*x^6+7392*x^4-39712*x^2+51200'); //defining the cunction
y=feval(x,f);
a=gca();
a.y_location = "origin";
a.x_location = "origin";
plot(x,y) // instruction to plot the graph
title(' y =x^8-170*x^6+7392*x^4-39712*x^2+51200')
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