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

A. $b^{2} - 4 a c = 0$
B. $b^{2} - 4 a c = 0$
C. $b^{2} - 4 a c = 0$
D. $b^{2} - 4 a c = 0$

Answer: Option A

Explanation:

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