which-of-the-following-is-a-common-error-when-applying-the-quadratic-formula

Question

Which of the following is a common error when applying the quadratic formula?

Accepted Answer

Mixing up the negative signs when calculating the $$b^{2} - 4ac $$term under the square root.

Answer

Multiplying the entire numerator by 2a instead of dividing by it.

Answer

Using only addition instead of both addition and subtraction before the square root.

Answer

Changing the $$b^{2}$$ term into $$b^{﻿3}$$ and cubing the number instead of squaring it.