-1
-2
-3
-4
Correct answer is D
x+3=0⟹x=−3
Using remainder theorem, if x + 3 is a factor, f(-3) = 0.
f(−3)=(−3)3+3(−3)2+n(−3)−12=0
−27+27−3n−12=0⟹−3n=12
n=−4
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