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diff --git a/29/CH9/EX9.10.21/exa9_10_21.sce b/29/CH9/EX9.10.21/exa9_10_21.sce
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+//caption:check_for_contrallability_and_observability_of_system
+//example 9.10.21
+//page 411
+A=[0 1 0;0 0 1;-6 -11 -6]
+B=[1 0 1]'
+C=[10 5 1]
+P=cont_mat(A,B);
+disp(P,"Controllability Matrix=");
+d=det(P)
+if d==0
+  printf("matrix is singular, so system is uncontrollable");
+else
+  printf("system is controllable");
+end;
+P1=obsv_mat(A,C);
+disp(P1,"Observability Matrix=");
+d1=det(P1)
+if d1==0
+  printf("matrix is singular, so system is unobservable");
+else
+  printf("system is observable");
+end;
+\ No newline at end of file