esoarerkt wrote...
I need to invert a 4x4 matrix in excel. I am doing something wrong
because
all I get is the first term of the inverted matrix.

The inverse of a 4x4 matrix would also be a 4x4 matrix. In Excel you'd
need to select a 4x4 range of cells, type the MINVERSE formula, then
hold down [Ctrl] and [Shift] keys before pressing [Enter] in order to
enter the formula as an array formula. Note that the first remark in
online help for MINVERSE is
"Formulas that return arrays must be entered as array formulas."