The product of the polynomials (3x 2) and (-x3 - 3) is. when this product is multiplied by (3 x), the coefficient of x4 in the result is

The product of the polynomials (3x 2) and (-x3 - 3) is - 3x^5-9x²

proof

(3x 2) (-x3 - 3) = - 3x^5-9x²

the main rules are as follows:

if we have ax^p multiplying by bx^q, so we can do the calculus as

(ax^p) (bx^q) = (ab) x^p+q