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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)

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14y ago

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9y ago

(x^2 + 3)(x + 2)(x - 2)

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Q: How do you factor x to the fourth power minus x to the second power minus 12?
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