Answer:
(f-g)(x) = x^4 - x^3 - 4x^2 - 3
Explanation:
(f-g)(x) = x^4 - x^2 + 9 - (x^3 + 3x^2 + 12)
(f-g)(x) = x^4 - x^2 + 9 - x^3 - 3x^2 - 12
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