Question

Which of the following is a root of the polynomial shown below? f(x)=x^3-x^2-9x+9




(Points : 2)
-9

-3

2

9

Answer 1

just just the factor theorem

which requires you to substitute into the polynomial... if f(-9) = 0 the -9 is a factor.

e.g. f(-9) =(-9)^3 -(-9)^2 -9(-9) + 9

= 72 so -9 is not a factor

just repeat the process.