1. (mn) ^2 = (7 * 4) ^2 = 28 ^2 = 7842. c - 3ab = (-2) - 3 * (-1) * 3 = 7
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1. (mn) ^2 = (7 * 4) ^2 = 28 ^2 = 784
2. c - 3ab = (-2) - 3 * (-1) * 3 = 7
2 c-3ab = (-2) - 3 * (-1) * 3 = 7