Factoring

6p^4-13p^3q^2-28p^3

I have come up with
(3p^2 + 4q)(2p^2 -7q^2q

2 answers

Fix the typos and repost.
Find all numbers that must be excluded from the domain of the given rational expression.
1) x^2+4x/x^2-16

2) 6x^3y-6xy/x^3+5x^2+4x

3) 4-x^2/x^2+x-6