Find the sum of all positive integers n for which n^2-19n+99 is a perfect square.

I know the quadratic formula, but how can it be used in this case, with two variables?

Could someone please explain this to me?

Thanking you in advance.

Find the sum of all positive integers n for which n^2-19n+99 is a perfect square.

I know the quadratic formula, but how can it be used in this case, with two variables?

Could someone please explain this to me?

Thanking you in advance.

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