Mathematics for IGCSE & O level - Equations (Section 1 - No. 28)

Which of the following is a main source of error when using the quadratic formula?

Incorrectly substituting the values of a, b, and c.

Incorrectly factorizing the quadratic equation.

Not using the correct formula.

Incorrectly identifying the coefficients a, b, and c.

Identifying and substituting the correct coefficients (a, b, and c) into the quadratic formula is essential.