### Mohamed Ennahdi El Idrissi

Resources -Summation/Product, Number of Nested Loops, From, To, Term. 1. Summation Product. Var, Value. Var, Value. OK. When $a \ne 0$, there are two solutions to \(ax^2 + bx + c = 0\) and they are $$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$

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