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You seem to have multiplied the 3 by the 4 and then raised the result, 12, to the 2nd power. You should have raised 3 to the 2nd power, and then multiplied the result by 4.
When you have an expression containing parentheses, such as 4(32), you should do the arithmetic inside the parentheses first. In the present case, here is the way to proceed.
