Fiona is completing the square to solve the polynomial equation.x2 – 4x + 1 = 0

To complete the square, first move the constant term away from the x-terms: subtract 1 from both sides to get x² − 4x = −1. This is the step of isolating the constant 1. Adding 1 to both sides would not isolate it on the opposite side.

AI-written and checked against the verified answer.