For a polynomial 𝑝(π‘₯) and a number π‘Ž, the remainder on division by π‘₯ – π‘Ž is 𝑝(a), so 𝑝(π‘Ž) = 0 if and only if (π‘₯ – π‘Ž) is a factor of 𝑝(π‘₯).

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