Question

factor: x^4+2x^3+4x^2+8x

Answer 1

x(x^2+4)(x+2)

Answer 2

lol sorry not to turn you down but I have the answer key for this, and thats not the answer. i'm wondering how they got the answer.
the answer is: (x^3+4x)(x+2)

Answer 3

x^4+2x^3+4x^2+8x
=x^4+4x^2+2x^3+8x
=x^2(x^2+4)+2x(x^2+4)
=(x^2+2x)(x^2+4)
=x(x+2)(x^2+4)
=x(x^2+4)(x+2)
=(x^3+4x)(x+2)