Posted by Kira on Tuesday, August 28, 2007 at 6:22pm.
set them equal, and solve for x
x^4-2x^2=2x^2
x^4-4x^2=0
(x^2-2x)(x^2+2x)=0
x^2(x-2)(x+2)=0
and now you have four solutions (two zeroes).
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