Question

factor the polynomial given that f(k)=0
f(x)=x^3+2x^3-9x-18 k=3

Answer 1

If f(k)=0, and k=3, then f(3)=0. That means that (x-3) is a factor. Divide that out and you'll be left with a quadratic.

Answer 2

can you show me? i still dont get it

Answer 3

Do you know synthetic division? That's probably easiest here, or you can use long division if you're more comfortable with that.

Answer 4

i dont know any of it i dont get it....