The area of a square is added to one of its sides, and the perimeter is then subtracted from this total, the result is 4. What is the length of one side?  Select the correct option:
A) 5
B) 4
C) 3
D) 2
E) 1

Rationale: the equation is ; side + area - perimeter = s + a - p = s + s ^ 2 - 4 s = s ( 1 + s - 4 ) . by plugging in the answers we can test the answers quickly ; then , 4 is the only possible answer . answer : b
Answer: B