Question 696718
They basically are asking you to factor the polynomial.  "Linear factors" mean they want the factors all with degree of 1.
.
p(x)=x^3-x^2-9x+9 
group terms:
p(x)=(x^3-x^2)-(9x-9) 
p(x)=x^2(x-1)-9(x-1)
p(x)=(x-1)(x^2-9)
p(x)=(x-1)(x^2-3^2)
p(x)=(x-1)(x-3)(x+3)