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+//Exa 1.20
+clc;
+clear;
+close;
+format('v',7);
+
+//Given Data :
+tA1=0;//degree centigrade
+tB1=0;//degree centigrade
+tA2=100;//degree centigrade
+tB2=100;//degree centigrade
+//tA=l+m*tB+n*tb^2
+l=0;//by putting tA and tB equals to zero
+//tA=m*tB+n*tB^2
+//Thermometer immersed in oil bath
+tA1=51;//degree centigrade
+tB1=50;//degree centigrade
+//solving for m and n by matrix
+A=[tB1 tB1^2;tB2 tB2^2];
+B=[tA1;tA2];
+X=A^-1*B;
+m=X(1);
+n=X(2);
+tA=25;//degree centigrade
+P=[n m -tA];//polynomial for calculation of tB
+tB=roots(P);
+tB=tB(2);//neglecting +ve sign
+disp(tB,"When A reads 25 degree C, B reading in degree C : ");
+//let tB=25;//degree C
+tB=25;//degree C
+tA=l+m*tB+n*tB^2;//degree C
+disp(tA,"When B reads 25 degree C, A reading in degree C : ");
+disp("B is correct. A shows error greater than B.")
+//Answer is not accurate in the book.