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diff --git a/22/CH4/EX4.1/ch4ex1.jpg b/22/CH4/EX4.1/ch4ex1.jpg
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+++ b/22/CH4/EX4.1/ch4ex1.jpg
diff --git a/22/CH4/EX4.1/ch4ex1.sce b/22/CH4/EX4.1/ch4ex1.sce
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+//signals and systems
+//Laplace Transform x(t) = exp(-at).u(t) for t negative and positive
+syms t s;
+a = 3;
+y =laplace('%e^(-a*t)',t,s);
+t1=0:0.001:10;
+plot2d(t1,exp(-a*t1));
+disp(y)
+y1 = laplace('%e^(a*-t)',t,s);
+disp(y1)