Help with Calculator.

[BlueLightning]

Hi everybody. I have a little problem with my calculator. It is a Texas Instruments TI-84 Plus Silver Edition. I need to do an operation to resolve simultaneus ecuations but with complex numbers (polar and rectangular). I have an aplication for Simultaneous Ecuations and Poly Root Finder but it doesn´t admit rectangular or polar numbers.

I tried with a matrix function called "rref(", it produces the reduced row echelon form by gauss jordan. In my classroom some people have superior versions of my calculator and they can resolve this complex number matrix using this function but the syntaxis they use is similar to this:

rref([5-4i,-2+4i,0,20; -2+4i, 9+5i,-7-8i,0;0,-7+8i, 12+2i,0])

And the calculator gives the result for the valor of the first, second and third element of the matrix. The thing is my calculator doesn´t have the ";" button, so I can´t introduce the matrix with this syntaxis.

Does anyone know how to resolve a matrix like this with my model of calculator?

[5-4i,-2+4i,0,20;
-2+4i, 9+5i,-7-8i,0;
0,-7+8i, 12+2i,0]

Or do I need to get me a TI-89 or Voyage 200 (which are the models my classmates use)?

Thank you in advance.