# (x+2) is a

From the factor theorem, we have

(x + 2) is the factor of f(x) if (f-2) = 0

Here, we have

f(-2) = (-2)4 – (-2)2 – 12

= 16 – 4 – 12

= 16 – 16

= 0

Therefore,

(x + 2) is a factor of (x4 – x2 – 12)

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