3x^3+5x^2-48x-80 divided by x+4

One way to do is to write the first polynomial in terms of the second; this means find so that

Expanding the right side and matching up coefficients of terms with the same power of gives

So we have

and in particular we can see divides this exactly, giving us

and expanding gives

it is b)

hope this : )

step-by-step explanation: