I gather that the way in which you meant to write the question was (x2)^{2}=8.
If so, I think the easiest way to solve this is to take the +/ square root of both sides to obtain that x2=±2i√2.
We can then solve for x to obtain x=2±2i√2.
Alternatively, (and I do not recommend this, although it may be useful in general if the root did not have a multiplicity...for instance (x2)(x3)=2, in which the factors are distinct), you can expand the left hand side and rewrite the equation as standard
form of a parabola equated to 0, and then solve for the roots.
In this problem, that would play out as: x^{2}4x+4=8 > x^{2}4x+12=0. Using the quadratic formula, we get x=2±2i√2, exactly as obtained before.
Hope this helps.
Jun 25

Suneil P.
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