Question

whats the formula for factoring polynomial

Answer 1

you basically regroup and take out common terms
then use the common factor for each group essentially more common terms

do you have a specific example you want to work through?

Answer 2

the remainder theorem says in my words if (x-a) is a factor of f(x) then when x = a the value of f(a) = 0

Answer 3

if you divide p by q and there is no remainder then q is a factor of p