x⁴ + 4 = x⁴ + 4x² + 4 - 4x² = (x² + 2)² - (2x)² = (x² + 2x + 2)(x² - 2x + 2)
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x⁴ + 4 = x⁴ + 4x² + 4 - 4x² = (x² + 2)² - (2x)² = (x² + 2x + 2)(x² - 2x + 2)