k³ + k² - k - 1 = (k³ + k²) - (k + 1) = k²(k + 1) - (k + 1) = (k + 1)(k² - 1) =
= (k + 1)(k + 1)(k - 1)
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k³ + k² - k - 1 = (k³ + k²) - (k + 1) = k²(k + 1) - (k + 1) = (k + 1)(k² - 1) =
= (k + 1)(k + 1)(k - 1)