źródło:
Zad. 5
W(x)=-(3-x)^2(x+2)=
=-(9-6x+x^2)(x+2^)=(-9+6x-x^2)(x+2)=
=-9x-18+6x^2+12x-x^3-2x^2=
=-x^3+4x^2+3x-18
odp. A …
Zad. 6
W(x)=ax^3-2ax^2-6x+2a
W(2)=8a-8a-12+2a=2a-12
2a-12=0
a=12:2
a=6