# Chapter 5 - Section 5.4 - Multiplication of Monomials - Exercise - Page 224: 29

$9x^8$

#### Work Step by Step

To raise a product to a power, raise each factor to the power. To raise a power to a power, multiply the exponents. $(-3x^4)^2=(-3)^2(x^4)^2=(-3)^2x^{4\times2}=9x^{8}$

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