Which of the following is the quadratic formula used to solve ax squared + bx + c = 0?
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A
x = -b plus or minus square root of (b squared - 4ac) all over a
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B
x = (-b plus or minus square root of (b squared - 4ac)) all over 2a
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C
x = (b plus or minus square root of (b squared + 4ac)) all over 2a
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D
x = -b over 2a