Chapter 7 - Exponents and Exponential Functions - 7-3 Multipying Powers with the Same Base - Mixed Review - Page 431: 87

$\frac{-3x^3z^6}{y^2}$

We start with the given expression: $-3x^3y^{-2}z^{6}$ The negative exponent rule states that for every nonzero number $a$ and integer $n$, $a^{-n}=\frac{1}{a^n}$. We use this rule to rewrite the expression with the currently negative exponent in the denominator: $\frac{-3x^3z^6}{y^2}$