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Neuron
If you would like to complete the square to form a true equation, you can do this using the following steps:

x^2 - 4 * x + ? = (x - ?)^2
x^2 - 4 * x + 4 = (x - 2)^2

The correct result is x^2 - 4 * x + 4 = (x - 2)^2.

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