A vacant rectangular lot is being turned into a community pool with a concrete path around it. The area of the lot is represented by 4x^2+4x−48, where x is the length of the path in yards. What is the length of the path?

The perimeter of △cde is 55 cm. a rhombus dmfn is inscribed in this triangle so that vertices m, f, and n lie on the sides cd , ce , and de respectively. find cd and de if cf=8 cm and ef=12 cm. the answer is not cd=20 and de=15. i have tried that one, it does not work.