Use the factor theorem to determine whether v + 5 is a factor of v 4 + 16v 3 + 8v 2 - 725.

Not sure what "factor theorem" refers to, but one theorem it might be another name for could be the polynomial remainder theorem. It says that a polynomial , when divided by a linear binomial , leaves a remainder whose value is . If the remainder is 0, then is a factor of .

In this case, for to be a factor of , we need to check



So is not a factor of .

Yes i also think it is b

Horizontal change or the change of x