There was a recent homework question that went along the lines of finding integer solutions to $(4x^2-1)(4y^2-1)=(4z^2-1)^2$, but it seems to be deleted now. Is this correct? I don't have 10k reputation, so I can't tell.
It would be pity if OP decided to delete this question because of the comments it received (telling that it should show some work). Since I also made a comment, I would feel particularly guilty if I made a contribution into deletion of the post.
Note that I am not attempting to revive discussion about homework problems, how much one should show effort, etc. I already know such threads exist (plenty in number) and are quite contentious in nature. I am just curious about the state of this particular post.