Bunuel wrote:

A rectangular circuit board is designed to have width w inches, perimeter p inches, and area k square inches. Which of the following equations must be true?

(A) \(w^2 + pw + k = 0\)

(B) \(w^2 – pw + 2k = 0\)

(C) \(2w^2 + pw + 2k = 0\)

(D) \(2w^2 – pw – 2k = 0\)

(E) \(2w^2 – pw + 2k = 0\)

Let w =2 & Lenght =3, P =10 & k =6

Most of choices have 2k & pw...then calculate them

2k = 12 & pw = 20 ...........To get zero we need more 8 positive and deduct from 20

8 - 20 +12 = 0 ...........this resemble only one form

Answer: E