Hello,

I need some help on this question. After squaring both sides, rearranging, then squaring again:

x^4-8x^2+x+12=0. 

I tried rational root, grouping, and double cross method to find the roots, but I'm not sure how to get the roots.

I also tried the "reversing role" method, by letting a=4 and trying to solve the equation for a, but I then I didn't find a way to factor it and after plugging in the quadratic formula I got a quartic again but now in terms of a and even more complicated.

Thanks,

Tina Jin