Browse · harp
Printimc
number theory intermediate
Problem
How many ordered pairs of positive integers, with , have the property that their squares differ by ?
(A)
(B)
(C)
(D)
Solution
Find all of the factor pairs of : You can eliminate and ( because you cannot have two numbers add to be an even number and have an odd difference at the same time without them being a decimal. You only have pairs left, so the answer is .
Final answer
B