Answer:
Explanation:
(f+g)(x) = -12x^3-10-6x+2
= -12x^3-6x-8
Since the problem asks for (f+g)(x), plug in the value 12 to get your answer.
(f+g)(12)=-20736-72-8 = -20816
Next, (f-g)(x).
(f-g)(x)=-12x^3-10+6x-2
=-12x^3+6x-12
=6144-48-12
=6084
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