Sue Lynn has two gardens in her backyard, one for flowers and one for vegetables.

The flower garden has an area that can be represented by the expression 9x2 - 12x-

5. The vegetable garden has an area that can be represented by the expression 20x2 -

7x - 3. Which expression can be used to represent how much larger the area of the

vegetable garden is in comparison to the area of the flower garden?