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diff --git a/3838/CH2/EX2.22.A/EX2_22_A.sce b/3838/CH2/EX2.22.A/EX2_22_A.sce
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+//EXAMPLE 2.22.A
+clc;
+t=0:1:15;
+t2=0:0.1:15
+x1=exp((-3)*t2).*(t2>=0);
+x2=t.*(t>=0);
+subplot(3,1,1);plot(t2,x1);
+xlabel('t');ylabel('x1(t)');
+title('signal x1(t)');
+subplot(3,1,2);plot(t,x2);
+xlabel('t');ylabel('x2(t)');
+title('signal x2(t)');
+T1=length(x1);
+T2=length(x2);
+x3=convol(x1,x2);
+t1=0:1:T1+T2-2;
+subplot(3,1,3);plot(t1,x3);
+xlabel('t');ylabel('x3(t)');
+title('signal x3(t) =x1(t)*x2(t)');