If you would like to know what is the product of (6 x^3 + 3 x) (x^2 + 4), you can calculate this using the following steps:
(6 x^3 + 3 x) (x^2 + 4) = 6 x^3 x^2 + 6 4 x^3 + 3 x x^2 + 3 4 x = 6 x^5 + 24 x^3 + 3 x^3 + 12 x = 6 x^5 + 27 x^3 + 12 x
The correct result would be 6 x^5 + 27 x^3 + 12 x.
