Which one of the following methods cannot be used to solve the equation $x^{2}-4 x-1=0$ ?
A) Quadratic formula
B) All of the methods can be used.
C) Factoring
D) Completing the square

Question

Quizplus · Accepted Answer

Factoring this specific quadratic equation directly is not straightforward because the equation does not factor nicely into simple binomial factors due to the constant term and the coefficients. The quadratic formula and completing the square are more universally applicable methods for solving quadratic equations, including those that do not factor neatly.

Which One of the Following Methods Cannot Be Used to Solve