Answer:

Explanation:
Given

x is a factor
Required
Solve for k
x is a factor means that the polynomial can be divided successfully by x.
In other words, x is a zero of the polynomial.
i.e.
and 
Substitute 0 for x in P(x)





Substitute 0 for P(x)

Collect Like Terms

Divide both sides by 5

A. I believe would be your answer