Answer
$$15x^3-57x^2+177x-529+\frac{1605}{x+3}$$
Work Step by Step
Dividing the two values using long division, it follows:
$$ 15x^3+\frac{-57x^3+6x^2+2x+18}{x+3}\\ 15x^3-57x^2+\frac{177x^2+2x+18}{x+3}\\ 15x^3-57x^2+177x+\frac{-529x+18}{x+3}\\ 15x^3-57x^2+177x-529+\frac{1605}{x+3}$$
