Which of the following is not a condition that must be met before you can use the quadratic formula to find the solutions?

Which of the following is not a condition that must be met before you can use the quadratic formula to find the solutions? A.One side of the equation must be zero. B.There can be no term whose degree is higher than 2. C.The coefficient of the x2-term can't be zero. D.The coefficient of the x2-term must be positive.