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The divisor given to you is (x + 4). We plug that into (x - c). Then we use the new value for c as the main factor to multiply each coefficient with.
(x - c) = (x - 4)
We will use -4 as the main factor to multiply each coefficient with.
Also, since no x squared term was given in your numerator, we must keep descending order of exponents when doing division of polynomials.
So, the new numerator becomes 5x^2 + 0x^2 + 6x + 256
The answer will be in the form
trinomilal - remainder/original divisor
5x^2 - 20x + 86 - [88/(x + 4)]
To learn how to do this yourself, visit the link below.