# Chapter 5 - Section 5.4 - Polynomials in Several Variables - Exercise Set - Page 375: 29

$-24x^{5}y^{9}$

#### Work Step by Step

The product of the given expression, $(-8x^3y^4)(3x^2y^5) ,$ is \begin{array}{l}\require{cancel} -8(3)x^{3+2}y^{4+5} \\\\= -24x^{5}y^{9} .\end{array}

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