(х-4)²-16 = (х-4)² - 4² = (х-4-4)(х-4+4) = (х-8)(х-0) = х(х-8)
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(х-4)²-16 = (х-4)² - 4² = (х-4-4)(х-4+4) = (х-8)(х-0) = х(х-8)