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anonymous

  • one year ago

Help please! If (x + k) is a factor of f(x), which of the following must be true? f(k) = 0 f(–k) = 0 A root of f(x) is x = k. A y intercept of f(x) is x = –k.

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  1. IrishBoy123
    • one year ago
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    If (x + k) is a factor of f(x), then f(x) = (x+k).g(x) i think you can work it out from there

  2. anonymous
    • one year ago
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    C??? because if f(x)=x+k) then wouldnt a root of f(x) x=k

  3. dan815
    • one year ago
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    f(-k)=0

  4. phi
    • one year ago
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    almost by definition of factor f(x)= (x+k)* g(x) what do we get when x= -k ? putting in -k for x we get f(-k) = (-k+k) * g(-k) we don't know what g(-k) is, but we do know what (-k+k) is what do we get for f(-k) ?

  5. anonymous
    • one year ago
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    the answer is A

  6. phi
    • one year ago
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    do you see f(-k) = (-k+k) * g(-k) becomes f(-k) = 0 * g(-k) and 0 * anything is 0

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