help me solve a problem please.

Hi I am new to matlab and need help in solving problem. Thre is a set of three non-linear equations and i used fsolve lsqnonlin but i am getting complex values. the solution should be real only.

A=9.276573254453513e+07

B=2.217725354910644e+09

C=9.438300268833828e+04

q=2.774309890414760e-05

A*x^1.75+B*x^2=C*(q-x)^1.75+A*y^1.75+B*y^2

A*y^1.75+B*y^2=C*(q-x-y)^1.75+A*z^1.75+B*z^2

x+y+z=q

initial guess- x=y=z=q/3

Please help. Solution is real only.

Answer 1

[Walter Roberson]

Because your ^1.75 is not an integer power, if one of the expressions being raised to that ^1.75 goes negative, the power will be evaluated using complex logs.

Sorry, I am out of time to follow this further.

Answer 2

[Saravanan Mani]

This equation is correct. I attach the file your mail id see there. Let know if any concern

Thanks, Saravanan Mani