Mathematics for IGCSE & O level - Equations (Section 8 - No. 6)
Which of the following is a valid method for finding the roots of a quadratic equation?
Taking the square root of both sides.
Using the quadratic formula.
Dividing by the leading coefficient.
Multiplying both sides by a constant.
คำอธิบาย
The quadratic formula directly provides the roots of a quadratic equation.