All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Just Math
A simple equation (Posted on 2018-06-24) Difficulty: 2 of 5
Solve (pen and paper only):


List all possible integer solutions.

No Solution Yet Submitted by Ady TZIDON    
No Rating

Comments: ( Back to comment list | You must be logged in to post comments.)
No Subject | Comment 1 of 3
a few very small steps: 
clearly x is not negative else the LHS is not integer.
x = 0 and y= +/- 3 is a solution.
for all y that work, so does -y, as LHS is positive
x are even, since this produces LHS numbers ending in ..09 and ...49
(x odd makes numbers ending in 19 and 39 which can not be squares)
likewise y ends in 3 or 7
I wonder how 5*3^x=(y-2)(y+2) might help

Edited on October 10, 2018, 5:24 pm
  Posted by Steven Lord on 2018-06-24 15:11:46

Please log in:
Remember me:
Sign up! | Forgot password

Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (2)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Copyright © 2002 - 2019 by Animus Pactum Consulting. All rights reserved. Privacy Information