Respuesta :

Answer:15x^4-29x^3+6x^2+8x

Step-by-step explanation:

(3x^2-7x+4)(5x^2+2x)

Open brackets

15x^4+6x^3-35x^3-14x^2+20x^2+8x

Add or subtract like terms

15x^4-29x^3+6x^2+8x

Answer:

15x^4-29x^3+6x^2+8x

Step-by-step explanation:

Ape-x