Please help!

Factor the polynomial.
17xy^4 +51x^2y^3

a) 7xy(10y^4 +44xy^2)
b) 17xy^3(y+3x)
c) 17xy [1+1/3xy^2]
d) xy(17+51xy^2)

What is the factored form of n^2+n?

a) n(n+n)
b) n(n+1)
c) 2(n+n)
d) 2(n+1)