What are the real or imaginary solutions of each polynomial equation?
X4 - 40x2 + 144 = 0

In order to solve equations like

we have to set up the auxiliary variable

and the equation becomes a standard quadratic equation.

In your case, we have

The solutions to this equation is given by

So, the two solutions are

Now recall that to solve for :

So, the four solutions are

what are ur choices?