## Calculus (3rd Edition)

$(-2,-1)\cup(1,2)$
We consider the function: $f(x)=(x^2-4)(x^2-1)$ Graph the function. From the graph we determine the solutions of the inequality: $f(x)<0$, therefore the values of $x$ for which the graph is under the $x$-axis: $(-2,-1)\cup(1,2)$