Snowy Driveway Rectangle polynomial question

Question

The area of a driveway in square meters, is represented by the expression 64x^2. If 100m^2 of the snow covered drive way has been shovelled, and the remaining driveway left to be shovelled is a rectangle, what are the dimensions of the rectangle.

Answer 1

64x^2-100x^2

64x-100=xy

I can't do any better with this imfo.