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Please answer this:2+2 =

Original Message (ID '187066') By Steve Keeley:
You're not getting the answer you want because it would be incorrect. x^4 + 2 x^2 + 1 does not factor into (x+1)^2*(x-1)^2. x^4 - 2 x^2 + 1 does factor into (x+1)^2*(x-1)^2. in: Factor[x^4 - 2 x^2 + 1] out: (x-1)^2 (x+1)^2