The sum of two numbers is 85 and their difference is 9 What is the difference of their squares

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## The sum of two numbers is 85 and their difference is 9. What is the difference of their squares?

(a) 765
(b) 845
(c) 565

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sum of two numbers = 85
x + y=85
difference of two numbers= 9                                                                                                                                                                      x - y=9
difference of their squares = x2-y2
(x + y)(x - y)=85 * 9=765

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