What is the least possible value of x^2-15 where x is a positive number.	Select:
A) -15  B) -14  C) -13  D) -12  E) -11
If x is a positive integer, the lowest value would be x = 1, because 0 is not included in the natural numbers. That's a technicality the GMAT would not expect students to know.   If x = 1, then the expression equals -14.   Answer = (-14).
<result>B</result>
What is the least possible value of x^2-15 where x is a positive number.