Answer:[tex]12x^8+15x^7-8x^6-10x^5[/tex]Step-by-step explanation:Start by using the FOIL method on your second and third terms.[tex](3x^2-2)(4x^2+5x)\\12x^4+15x^3-8x^2-10x[/tex]Next, multiply the first term ([tex]x^4[/tex]) against your result.[tex]x^4(12x^4+15x^3-8x^2-10x)\\12x^8+15x^7-8x^6-10x^5[/tex]