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How many integers exist for the value of n such that n²-19n+91 is perfect square?

How many integers exist for the value of n such that n²-19n+91 is perfect square?
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How many integers exist for the value of n such that n²-19n+91 is perfect square?

User Clavin
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one because then it would be (ax+b)^2=cx^2+dx+e if cx^2+dx+e is a perfect square
User Sven Tan
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