If x=4 is a root, what is the corresponding factor?

(x - 4)

Step-by-step explanation:

Given x = a is a root then (x - a) is the corresponding factor

Given x = 4 is a root, then

(x - 4) ← is the corresponding factor

Note if x = - 4 is a root, then

(x - ( - 4)), that is (x + 4) is the corresponding factor