## anonymous one year ago If (x – 5) is a factor of f(x), which of the following must be true? A root of f(x) is x = –5. B) A root of f(x) is x = 5. C) Both x = –5 and x = 5 are roots of f(x). D) Neither x = –5 nor x = 5 is a root of f(x).

1. anonymous

if$f(x)=(x-5)\times \text{something}$ then $f(5)=(5-5)\times \text{something}$ i.e. $f(5)=0$

2. anonymous

since $$f(5)=0$$ we say " a root of $$f(x)$$ is $$5$$"

3. anonymous

it'd B

4. anonymous

@satellite73