2001 IMO Shortlist Problems/N5
Problem
Let be positive integers and suppose that
![$ac + bd = (b + d + a - c)(b + d - a + c).$](http://latex.artofproblemsolving.com/4/0/9/40987fe427069b0fea5c78a8c84a1ae1f2992a08.png)
Prove that is not prime.
Solution
This problem needs a solution. If you have a solution for it, please help us out by adding it.
Let be positive integers and suppose that
Prove that is not prime.
This problem needs a solution. If you have a solution for it, please help us out by adding it.
Something appears to not have loaded correctly.