Which expression is equivalent to (4 x cubed) (2 x) Superscript negative 4?

The answer is 4. I don't quite know how to show you my working, because I just got example numbers of the original dimensions of the room and found the area, and then doubled each and the area was always 4 times larger. You can think of it like because you're multiplying the width by 2 and the length by 2, you're doing 2 × 2 = 4. I hope this helps!