Answer:
D
Step-by-step explanation:
(3x³ + 5x)/(x+1)
(3x³ + 3x² - 3x² - 3x + 8x + 8 - 8)/(x+1)
[3x²(x+1) - 3x(x+1) + 8(x+1) - 8]/(x+1)
3x² - 3x + 8 - 8/(x+1)
