Answer:
I got -3x^3 + 9x^2 + 7x+ 20
Step-by-step explanation:
Frist do distrubtive property then combine all like terms.
-3x^3 + 9x^2 + 7x + 20
(3x^2 × (-x +4)) + (3x × (-x +4)) + (5 × (-x +4))=
=-3x^3 + 9x^2 + 7x + 20
