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Neuron
If you would like to simplify (3n - 2m)^2, you can do this using the following steps:

(3n - 2m)^2 = 3^2 * n^2 - 3 * 2 * 2 * n * m + 2^2 * m^2 = 9n^2 - 12nm + 4m^2

The correct result would be d. 9n^2 - 12nm + 4m^2.