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Corrected the post; thanks, Mathsyperson.
y=[-1 ± √(1 + 224)]/8, actually. That means that y=-2 or 1.75 and the original proof wanted x and y to both be natural, meaning that these values are disregarded. The same applies to your second post where x=1. Sorry!
When we put x=1,
Another question - has this been already proved or did you toss a random problem?
Thanks for the puzzle, juki.
is this what we need to prove?
1. x and y are two natural numbers such that 3x^2 + x = 4y^2 +y . Prove that x - y is the square of a whole nnumber rate this problem from 0 to 10 and tell ur soloution