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Find the sum of all integral values of $c$ with $c\le 25$ for which the equation $y=x^2-7x-c$ has two rational roots.

 

Thanks in advance! :)

 Feb 18, 2021
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The sum of all integral values of c is 1 + 2 + 19 + 20 = 42.

 Feb 18, 2021

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