for part i, why is the degree 3?

Thank you for helping me out!

Hello, good question! The degree of polynomial refers to the highest power of x in this case. Here, we see that Q(x) is multiplied by (x^2-1) to get x^5 on the left side. Hence, in order to get x^5, Q(x) would have a x^3 present and this would be the degree as it’s the highest power. [x^3 * x^2 is x^5)

Ahhhh....now i understand. Thank you so much, Tutor!