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diff --git a/29/CH7/EX7.17.3/exa7_17_3.sce b/29/CH7/EX7.17.3/exa7_17_3.sce
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+//caption:stability_using_Nyquist_criterion
+//example 7.17.3
+//page 238
+clf();
+s=%s;
+s1=-s;
+g=(s+0.25)/(s^2*(s+0.5)*(s+1));
+g1=(s1+0.25)/(s1^2*(s1+0.5)*(s1+1));
+GH=syslin('c',g);
+GH1=syslin('c',g1);
+nyquist(GH);
+nyquist(GH1);
+mtlb_axis([-2000 500 -30 30]);
+xtitle('Nyquist plot of (s+0.25)/(s^2*(s+0.5)*(s+1))')
+figure;
+show_margins(GH,'nyquist')
+disp("since the point(-1+%i0) is  encircled clockwise by Nyquist plot ,so N=-1 and P=1(given)")
+N=-1;//no. of encirclement of -1+%i0 by G(s)H(s) plot anticlockwise
+P=1;//no. of poles of G(s)H(s) with positive real part
+Z=P-N;//np.of zeros of 1+G(s)H(s)=0 with positive real part
+disp(Z,"Z=")
+disp("as Z=2,there are two roots of closed loop characterstics eq having positive real part, hence system is unstable.")
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