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1. $a x^{2} + b x + c = 0$

A. $\frac{- b \pm \sqrt{b^{2} - 4 a c}}{2 a}$
B. $\frac{- b \pm \sqrt{b^{2} - 4 a c}}{2 a}$
C. $\frac{- b \pm \sqrt{b^{2} - 4 a c}}{2 a}$
D. $\frac{- b \pm \sqrt{b^{2} - 4 a c}}{2 a}$

Answer: Option A

Explanation:

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