Note that $ x^4 + 8x^2 + 16 = (x^2 + 4)^2 $ and $ 16y^4 - 64 = 16(y^4 - 4) = 16(y^2 - 2)(y^2 + 2) $.

Sat, 02 May 2026 22:00:35 +0000

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