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No integer roots (Posted on 2017-10-22) Difficulty: 3 of 5
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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