The sum of two numbers is 75 and their difference is 20. Find the difference of their squares.  Choose the correct answer
A) 3000
B) 2700
C) 1500
D) 1254
E) 3421
If the sum of two numbers is x and their difference is y, then the difference of their squares is xy.   Here x= 75 and y = 20   75 × 20 = 1500
<result>C</result>
The sum of two numbers is 75 and their difference is 20. Find the difference of their squares.