Hi

The factor theorem states that a polynomial f(x) has a factor (x − k) 

if and only if f(k) = 0

f(x)=(x-4)(x+2)(x-1)

(x-4)(x+2)(x-1) = 0

(x-4)= 0  x = 4

(x+2)= 0  x = -2

(x-1)= 0  x = 1

these x-values are the "Zeros" of this polynomial 

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