Question

(5v^5+10v-4)-(9v^5-8v^2+17)

Answer 1

start by distributing the 1 and -1 to break the parenthetical parts.
5v^5+10v-4-9v^5+8v^2+17 now you just have to combine like terms.
-4v^5+8v^2+10v+13 it's technically not fully simplified by leading with a negative (even though the power is leading) so,
\[8v^2-4v^5+10v+13\]

Answer 2

that constant should be -21. I forgot to change the sign when i distributed the -1 across.

8v^2-4v^5+10v-21