Mathematics for IGCSE & O level - Equations (Section 7 - No. 39)
Which of these are key steps when applying the quadratic formula?
Identify the values of a, b, and c from the quadratic equation.
Substitute these values into the formula.
Simplify the equation and solve for x.
Always change the subject of a formula before solving.
Giải thích
All but the subject change are key steps in using the quadratic formula.