If x and y are integers such that (x+1)^2 is less than or equal to 64 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?	Select
A) -16 B) -18 C) 0 D) 14 E) 16
(x+1)^2 &lt;= 64   x &lt;= 7   x &gt;= -9   (y-1)^2 &lt; 64   y &lt; 9   y &gt; -7   Max possible value of xy is -9 × -6 = 54   minimum possible value of xy is -9 × 8 = -72   -72 + 54 = -18   Answer : -18
<result>B</result>
If x and y are integers such that (x+1)^2 is less than or equal to 64 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?