If the equation has a solution, the fixed value on the right side of the inequality sign, no matter what value Xo takes, the result must be within the range of the formula on the right side, a >;; 0, the opening is upward, so the value is greater than the minimum value. In other words, "No matter what value Xo takes, there is an X that can make the value of the quadratic function smaller than the fixed value on the right." To sum up, choose B.