The sum of two number is 25 and their difference is 13. Find their product.  Choose the correct option
A) 104
B) 114
C) 315
D) 325
E) 271
Let the numbers be x and y.   Then, x + y = 25 and x - y = 13.   4xy = (x + y)2 - (x- y)2   = (25)2 - (13)2   = (625 - 169)= 
<gadget id="calculator">(625 - 169)</gadget>
<output>456</output>
456   xy= 114.   Answer: 114
<result>B</result>
The sum of two number is 25 and their difference is 13. Find their product.