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diff --git a/2825/CH2/EX2.9/Ex2_9.sce b/2825/CH2/EX2.9/Ex2_9.sce
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+//Ex2_9 Pg-91
+clc
+
+disp("For P-type,Nd=0. By charge neutrality and mass action law,")
+
+disp("      p + Nd = p = +na = (ni)^2/n")
+
+disp("or    n^2 + Na*n - (ni)^2 = 0")
+
+disp("Solving the quadratic equation for n and discharging the extraneous negative root,one obtains")
+
+disp("      n = 0.5*(-Na + sqrt(Na^2 + 4*ni^2))")
+
+disp("Knowing n,one obtains from mass action law p = ni^2/n")
+
+disp("For N-type doping,Na=0. By analogous procedure,")
+
+disp("      p = 0.5*(-Nd +sqrt(Nd^2 + 4*Ni^2));  n=ni^2/p")