syms x d1 d2;q1='0.11645*x^2-0.040876-d1*x*0.4825971';q2='d2-d1+0.4825971*x';q3='1693.87*exp(-0.048909)*normcdf(d1)-1700*exp(-0.011645)*normcdf(d2)-35.95';fsolve(q1,q2,q3,'x','d1','d2');