Help me understand a solution for a simple Number Theory problem – math.stackexchange.com

Help me understand a solution for a simple Number Theory problem – math.stackexchange.com

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Problem: Show that there are no $3$-digit primes $\overline {abc}$ such that $b^2-4ac=9$. Solution. Upon the given condition, the quadratic equation $ax^2+bx+c$ can be written as $(px+q)(rx+s)$ and ...

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