let's show your
x^4(3x^3-2)(4x^2+5x)
(x^4(3x^3-2))(4x^2+5x)
(x^4(3x^3-2))(4x^2)+(x^4(3x^3-2))(5x)
12x^9+15X^8-8x^6-10x^5
the answer was 12x^9+15^8-8x^6-10x^5
hope that helps you
