It is known that: x2 + Y2 + 4x-6y + 13 = 0, where x and y are rational numbers, then YX=______ ．

From the meaning of the question, we can get: (x + 2) 2 + (Y-3) 2 = 0. From the nature of non negative number, we can get x = - 2, y = 3. Then YX = 19

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