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Using the remainder theorem if f(x) is a polynomial and (x-a) is a factor of f(x) the f(a)=0.
Since f(x) is divisible by (x+1);
When f(x) is divided by `(x+3)` the remainder is given by `f(-3)` .
`f(-3)=9+6-3 = 12`
So the remainder when f(x) is divided by (x+3) is 12.
Correct answer is C.
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