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diff --git a/1523/CH12/EX12.9/ex12_9.sce b/1523/CH12/EX12.9/ex12_9.sce
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+// Network Synthesis : example 12.9 : (pg 12.6)
+s=poly(0,'s');
+p1=((s^5)+(3*(s^3))+(2*s));
+p2=((5*(s^4))+9*(s^2)+2);
+[r,q]=pdiv(p1,p2);
+[r1,q1]=pdiv(p2,r);
+[r2,q2]=pdiv(r,r1);
+[r3,q3]=pdiv(r1,r2);
+[r4,q4]=pdiv(r2,r3);
+printf("\n P(s) = ((s^5)+(3*(s^3))+(2*s))");
+printf("\n d/ds.P(s)= ((5*(s^4))+9*(s^2)+2)");
+printf("\nQ(s)=P(s)/d/ds.P(s)");
+// values of quotients in continued fraction expansion
+disp(q);
+disp(q1);
+disp(q2);
+disp(q3);
+disp(q4);
+printf("\nSince all the quotient terms are positive, P(s) is hurwitz");