we have
4(2−3w)(w^2−2w+10)
Apply distributive property
4{2w^2-4w+20-3w^3+6w^2-30w}
4{-3w^3+8w^2-34w+20}
-12w^3+32w^2-126w+80
Apply distributive property
(2−3w)(w^2−2w+10)=(2)(w^2)+(2)(-2w)+(2)(10)-3w(w^2)-3w(-2w)-3w(10)
(2−3w)(w^2−2w+10)=2w^2-4w+20-3w^3+6w^2-30w
4{2w^2-4w+20-3w^3+6w^2-30w}
4{-3w^3+8w^2-34w+20}
-12w^3+32w^2-126w+80