The corrected hint is:
inv.w with inc.w operations turns an operand into its two’s complement. For example,
“inv.w operand followed by inc.w operand”, will take the 2’s complement of the operand.
In the hint I posted, due to bad copy and paste, the bold faced part was missing. If you have already submitted your MT2 with the incorrect hint, then no points will be taken off your MT2.