What is the best method to solve a quadratic equation with no "b"?

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2 points
factor
square root
completing the square
quadratic formula

The best method to solve a quadratic equation with no "b" is by using the quadratic formula, which is:

x = (-b ± √(b^2 - 4ac)) / (2a)

Where "a", "b", and "c" are the coefficients of the equation.