Chapter 1 - Equations and Inequalities - Exercise Set 1.6 - Page 178: 1

$x=-4,0,4$

First, set the terms in the parentheses equal to zero, and do the same with $3x^{2}$. Then solve for each and include each solution in the final answer. $3x^{2}(x^{2}-16)=0$ $x^{2}-16=0$ $x=±4$ $3x^{2}=0$ $x=0$ $x=-4,0,4$