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diff --git a/1670/CH9/EX9.11/9_11.sce b/1670/CH9/EX9.11/9_11.sce
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+//Example 9.11
+//Particular Solution
+//Page no. 294
+clc;clear;close;
+
+x=poly(0,'x')
+n=2;
+f=x^(n)-0*x^(n-1)-4*x^(n-2);
+z=roots(f)
+disp(z,f)
+printf('\n\n')
+printf('            n       n\nC.F.  = ')
+for i=1:n
+    printf('c%i(%g)',i,z(i))
+    if i~=n then
+        printf(' + ')
+    end
+end
+A=[-3,0,0;4,-3,0;4,2,-3];
+B=[1;1;-1];
+C=inv(A)*B;
+printf('\n\n\t  \t  2\nP.I = (%g)n+(%g)n+(%g)',C(1),C(2),C(3))
+\ No newline at end of file