I want the calculator to answer with the parameter answer, not with a numeric value, I have tried to clear "M" variable with no success. Any idea?
https://i.stack.imgur.com/y36vz.jpg
( sorry I don't have enough reputation to post image directly here)
You can't do "symbolic manipulations" with the TI-84. You would need a TI-89 or something equivalent. The TI-84 will only be able to give you numerical answers. When you clear a variable, you are setting the variable equal to zero. So, you are really just computing the determinant: $$ det \pmatrix{0 & 1 & 1 \\ 1 & 0 & 1 \\ 1 & 1 & 0} $$ which is equal to $2$.