9. Divide by
   A.
   B.
   ©
   D. r 5
   E.

To divide by , we can use polynomial long division.

So, the result of the division is with a remainder of . Thus, the correct answer is .

If you were to check your work, substituting back into the original equation could help ensure the calculations were done correctly. Common mistakes include forgetting to subtract correctly or miscalculating during multiplication, so double-check each step to make sure you get it right!

For further exploration, you might want to dive into synthetic division, a quicker method for polynomials, especially useful when dealing with linear divisors. It’s a handy tool in algebra that streamlines the process of polynomial division, saving you time and effort when tackling larger equations!