SOLUTION: why is the problem shown not factorable with rational numbers: 1-xy-20x^2 y2

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Question 945683: why is the problem shown not factorable with rational numbers:
1-xy-20x^2 y2
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
why is the problem shown not factorable with rational numbers:
1-xy-20x^2 y2
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1-xy-20x^2y^2 is factorable.
= (1 + 4xy)*(1 - 5xy)