What are the solutions of 4x4 - 4x2 = 8?

To get the solution of this equation, we perform factoring first to simplify the equation:

4x4 - 4x2 = 8

4x2 (x2-1) = 8

x2 (x2-1) = 2

let x2=1 and (x2-1) = 2 to satisfy the equation. Then,

x2=1

x = + 1 and - 1

x2-1=2

x2 = 2+1

x = + √3 and - √3

The 4 roots of the 4th-degree polynomial is - 1, + 1, + √3 and - √3.

X=+_i

and

x=+-sqrt2

so its A anc C