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12 - 4 = (1 * 1) - 4 = 1 - 4 = -3
-4 - 12 = -16
3x^4 - 12 = 3(x^4 - 4) = 3(x² + 2)(x² - 2)
It is 3/4 minus 1/3 is the same as 9/12 minus 4/12 = 5/12