Posted by CheezyReezy on Wednesday, June 1, 2011 at 8:57pm.
Substitute: x^2=z => x^4=z^2
z^2-91z-900=0
(z-100)(z+9)=0
If z=100, x^2=100 then x=10 or x=-10
If z=-9, x^2=-9=9i^2 then x=3i or x=-3i
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