ok i was looking over my notes and a little confused at what my prof was doing on his ti 89 in lecture last week.

the command line reads as follows...

rref(d-2 identity(3))

i forgot to reference this with the problem..

im thinking the d means determinant and 2 is an eignevalue and 3 is the identity of a 3 x 3 matrix?

is this right or am i wrong?