perplexus.info :: Just Math : No integer roots

No integer roots (Posted on 2017-10-22)

Without solving the equation
15x^2-7y^2=9
explain why it has no integer roots.

No Solution Yet Submitted by Ady TZIDON

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re: Another approach

| Comment 3 of 4 |

(In reply to Another approach by Brian Smith)

This is not correct, Brian.

15x^2 can equal 0 mod 9. Consider x = 0 or x = 3.

Posted by Steve Herman on 2017-10-22 22:30:49

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