# How do you solve #(x^2-9)*(x^2-16)<=0#?

##### 1 Answer

Jun 22, 2015

Hence solution:

#### Explanation:

Let

Each of the roots of

For large positive and negative values of

Hence

Here's a graph of

graph{(x^2-9)(x^2-16)/20 [-9.68, 10.32, -1.52, 8.48]}