`\frac{\left(3x^{3}+17x^{2}+21x-9\right)}{\left(x+3\right)}`

1 answer

To simplify this expression, we first perform polynomial long division:

3x^2 + 8x - 3 + (-18)/(x + 3)

Therefore, the simplified expression is:

3x^2 + 8x - 3 + (-18)/(x + 3)