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8-99.

Which of the following binomials could be a factor of $x^{3} − 9x^{2} + 19x + 5$? Explain your reasoning.

1. $x−2$

1. $x−5$

1. $x+3$

1. $x+2$

Binomial (b) because $5$ is a factor of the last term, but $2$ and $3$ are not.