3x^4 - 12 = 3(x^4 - 4) = 3(x² + 2)(x² - 2)
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x4 - x2 - 12 = (x2 + 3) (x2 - 4)And (x2 - 4) = (x + 2) (x - 2)So the original expression = (x2+ 3) (x + 2) (x - 2)
1/12
X4 - 144 (X2 - 12)(X2 + 12) As there is no linear term I see no further factoring.
Two thirds minus one fourth is equal to five twelfths.