Question

Which of the following is a factor of 32x^3 + 4?

Answer 1

4 + 32x^3
= 4*(1 + 8x^3)
= 4*(1 + 2x)*(1 - 2x + 4x^2)

Answer 2

To be more clear :)
32x^3 + 4
=4(8x^3 + 1)
=4((2x)^3 + 1^3)
=4(2x + 1)((2x)^2 - 2x + 1)
=4(2x +1)(4x^2 - 2x + 1)

Answer 3

Cheers!