Question 439474
First we simplify the function:

{{{y=(x^2-i^2)(x^2-4i^2)=(x^2+1)(x^2+4)=x^4+5x^2+4}}}.

Now you know how to graph the function.

{{{graph(300, 300, -5, 5, -1, 10, x^4+5x^2+4)}}}.