SOLUTION: How do I factor this by showing steps taken 1-xy-20x^2 y^2

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Question 946174: How do I factor this by showing steps taken
1-xy-20x^2 y^2
Answer by Alan3354(69443) About Me  (Show Source):
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How do I factor this by showing steps taken
1-xy-20x^2 y^2
Don't put spaces between the variables.
1-xy-20x^2y^2
You find a pair of factors of 20 that differ by 1.
It's 4 & 5
The xy term is negative --> the 5 is negative.
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1 - xy - 20x^2y^2 = (1 + 4xy)*(1 - 5xy)