Answer:
Step-by-step explanation:
Since x-8 is a factor, this means that f(x)/(x-8) should return the quadratic factor.
I can't really show you the long division here, but just know that this gives you a quotient of x^2 - x + 6.
This means that f(x)=(x-8)(x^2 - x + 6)=(x-8)(x-3)(x+2).
Setting each of these factors equal to 0, we get the roots to be 8, 3, and -2.
