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The quadratic formula to find roots of ax^2 + bx + c = 0 is:

Ax = (-b ± √(b^2 - 4ac)) / 2a

Bx = (b ± √(b^2 - 4ac)) / 2a

Cx = (-b ± √(b^2 + 4ac)) / 2a

Dx = -b / 2a