Answer
$$ (-9x)(2x^4) \\ (-18x^2)(x^3) \\ (-9x^4)(2x)$$
Work Step by Step
We are looking for three factors of the monomial, so we need three sets of two values that each multiply to get the original monomial. Some examples include:
$$ (-9x)(2x^4) \\ (-18x^2)(x^3) \\ (-9x^4)(2x)$$