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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shorter, not really different

Comment 4 of 4 |

Considered mod 5:

-7y^2 = 9

3y^2 = 9

y^2 = 3 which is impossible.

Posted by xdog on 2017-10-23 09:51:09

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