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+//Chapter 4, Exmaple 4, page 141
+//Claculate distance to produce avalanche
+clc
+clear
+//Rewrite equation 4.2
+//using the values of a and b from previous example
+//convert integartion to quaderatic equation form
+x=poly(0,"x");
+p=59.97-4*10**4*x+7.5*10**5*x^2 // making the polinomial equation
+r= roots(p) //obtaining the roots
+printf("\n %f m or %f m away from the cathode",r(1),r(2))
+
+//Answer may vary due to round of error.