Editor
The quadratic formula is
Difficulty: Easy
A: 
$x=\frac{a\pm\sqrt{b^{2}-4ac}}{2a}$
B: 
$x=\frac{-a\pm\sqrt{b^{2}-4ac}}{2a}$
C: 
$x=\frac{b\pm\sqrt{b^{2}-4ac}}{2a}$
D: 
$x=\frac{-b\pm\sqrt{b^{2}-4ac}}{2a}$
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