Question

Use a graphing calculator to assist you in finding the roots of the function.

Answer 1

Given the function below

$f(x)=3x^4-26x^2-9$

The graph of the given function is

Using a graphing calculator,

The roots of the given function are

$x=\frac{i\sqrt[]{3}}{3},-\frac{i\sqrt[]{3}}{3},3,-3$

Hence, the answer is the third option