x² + 6x + 8 = (x² + 6x+ 9) - 1 = (x + 3)² - 1² = (x + 3 - 1)(x + 3 + 1) =
= (x + 2)(x + 4)
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x² + 6x + 8 = (x² + 6x+ 9) - 1 = (x + 3)² - 1² = (x + 3 - 1)(x + 3 + 1) =
= (x + 2)(x + 4)