Task: Question Answering
Input (English): Problem: if x and y are integers such that ( x + 1 ) ^ 2 is less than or equal to 81 and ( y - 1 ) ^ 2 is less than 64 , what is the sum of the maximum possible value of xy and the minimum possible value of xy ? 
Options: a ) - 16 , b ) - 20 , c ) 0 , d ) 14 , e ) 16
Output (English): b