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by pavel_lishin 5049 days ago
I thought it was meant to give us an intuitive explanation for why we approach things via the "factoring algorithm" as a method of solving these guys.

In any case, it's just a simple example case. x^2 + x = 6 can probably be solved just by staring at it for a little bit, but once the equation gets more complex, trying out a couple of numbers in the [-5,5] range is not gonna work anymore.