# Chapter 1 - Section 1.6 - Properties of Integral Exponents - Exercise Set - Page 79: 13

$21x^{5}y^{}z^{4}$

#### Work Step by Step

RECALL: The product rule of exponents states that: $a^m \cdot a^n=a^{m+n}$. Multiply the numerical coefficients, and use the rule above to find: $\\=21x^{4+1}y^{0+1}z^{1+3} \\=21x^{5}y^{1}z^{4} \\=21x^{5}y^{}z^{4}$

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