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Which is the quadratic formula for ax² + bx + c = 0?
Ax = (−b ± √(b²−4ac))/a
Bx = (−b ± √(b²+4ac))/2a
Cx = (b ± √(b²−4ac))/2a
Dx = (−b ± √(b²−4ac))/2a
Answer & Solution
Correct answer: D. x = (−b ± √(b²−4ac))/2a
Completing the square on the standard form leads to the roots (−b ± √(b² − 4ac)) / 2a.
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