Question

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

Answer 1

use foil!

Answer 2

\[12x^6+x^5+21x^4-2x^3+8x^2\]

Answer 3

I would probably just distribute the second trinomial to each term in the first
4x^3 (3x^3 + x^2 + 4x) - x^2 (3x^3 + x^2 + 4x) + 2x(3x^3 + x^2 + 4x)
and then distribute each single term through and simplify by adding like terms