If the sum and difference of two numbers are 10 and 8 respectively, then the difference of their square is:
Choose the correct choice from the following answers
A) 12
B) 28
C) 160
D) 180
E) 80
Let the numbers be x and y.   Then, x + y = 10 and x - y = 8   x2 - y2 = (x + y)(x - y) = 10 * 8= 
<gadget id="calculator">10 * 8</gadget>
<output>80</output>
80.   ANSW80R:80
<result>E</result>
If the sum and difference of two numbers are 10 and 8 respectively, then the difference of their square is: